From 4 to 5 on the Funding. . These micas act like small mirrors that reflect the light. There are many types of this rock so they may be named for mineral comprising the rock.e.G. Gneiss uses in construction industry include As dimension stone. This is especially true if the stone breaks into flat layers or if the mica grains are small. If you compress mud (underneath the weight of the ocean and a whole lot of other mud) you get shale. With further metamorphism, the schist will become gneiss. In the convergent plate boundary environment, heat and chemical activity transform the clay minerals of shales and mudstones into platy mica minerals such as muscovite, biotite, and chlorite. Schist bedrock can pose a challenge for civil engineering because of its pronounced planes of weakness. There are a few rocks that look close enough to schist that they can easily confuse people, so it is useful to know what some of those closely-related rock types are called and what they look like. In Australia, houses that were built using schist in the 1800s are still standing today. The huge variation in the mineralogy of schist means that it can come in a wide variety of colors. This allows you to see the individual grains and internal structures more clearly and often helps you identify the specific species of minerals present in a rock. If more heat and pressure continue, the rock gets even harder and forms a granular rock known as gneiss. Freeman, pp. Schists are mostly the precambrian ages rocks. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. Mica schist often contains muscovite mica rather than biotite, although both minerals are common. Schist. Geological foliation (metamorphic arrangement in layers) with medium to large grained flakes in a preferred sheetlike orientation is called schistosity. Abstract and Figures. This texture allows the rock to be broken into thin slabs along the alignment direction of the platy mineral grains. If the metamorphism proceeds further, the mica schist experiences dehydration reactions that convert platy minerals to granular minerals such as feldspars, decreasing schistosity and turning the rock into a gneiss. Talc schist contains abundant talc; it has a greasy feel, a well-developed schistosity, and a grayish-green colour. [11] If all that is known is that the protolith was a sedimentary rock, the schist will be described as a paraschist, while if the protolith was an igneous rock, the schist will be described as an orthoschist. It is often referred to as schistosity because of its large mica flakes. Schist is faliated medium grade metamorphic rock. His carefully constructed definition established the pressure and temperature conditions which produce this type of metamorphism. ", Slate is has a dull luster, it can be split into thin sheets along the parallel mineral alignments, and the thin sheets will ring when they are dropped onto a hard surface. Phyllite is a durable and soft rock. 4-Step Guide to Clean a Limestone Fireplace, Thickness of Granite Countertop: Important Things to Consider. [26] A hazard may exist even in undisturbed terrain. The directed pressure pushes the transforming clay minerals from their random orientations into a common parallel alignment where the long axes of the platy minerals are oriented perpendicular to the direction of the compressive force. The metamorphic heat, pressure, and chemical activity convert the clay minerals in protoliths (shale or mudstone) into platy (plate-like) mica minerals such as biotite, chlorite, and muscovite. But you can also use your knowledge and intuition! These are usually shales or mudstones. If it is known that a schist formed from a sedimentary rock (most common) it is called a paraschist, and if it formed from an igneous rock it is called an orthoschist. It has been previously used to make decorative rock walls. Schist is composed predominantly of mica minerals, which impart a platy or layered texture to the rock. I may receive a commission for purchases made through these links at no additional cost to you. The word "schist" means "to cleave" from the Greek "schizein," or ".". The rock usually forms from sedimentary rocks like shale or mudstones. Then, try to identify the major platy minerals and any bulky accessory minerals like quartz, garnet, or kyanite. These were formed through metamorphism of the clay minerals present in the protolith. The word schist is derived ultimately from the Greek word (schzein), meaning "to split",[1] which refers to the ease with which schists can be split along the plane in which the platy minerals lie. This gives them a pronounced look in the rock and usually disrupts the schistose texture. Varieties of this rock type share similarities in appearance (schistosity) but may be highly variable in composition. Soapstone (Talc-Chlorite Schist) Anton Savchenok and Leonid Hariuzov Talc-chlorite schist in geological, architectural, and local history literature is called "pot stone" or "soapstone".Itisa metamorphic rock consisting of talc, magnesite, and chlorite. You will see rocks labeled muscovite schist, biotite schist, and chlorite schist. feasible to differentiate among sedimentary and igneous schists and gneisses. Similarly, there is wide range of uses of Schist. Some uses for this rock isare decorative rock wall, pillars, paint fillers, and roofingmaterial. Among the different types of rocks, marble is the most widely used rock. The ease with which the rock splits along the aligned grains accounts for the schistosity. Pay close attention to the edges, where you can see into the stone a bit. If the heating and compression increase, the slate will become phyllite, which is a shiny version of slate. [2], In Minoan Crete blueschist and greenschist were used to pave streets and courtyards between 1650 and 1600 BC. Sources . If you see gneiss or phyllite, chances are that if you follow that formation one way or the other it will gradually grade into schist. Muscovite schist, biotite schist, and chlorite schist (often called "greenstone") are commonly used names. There are phyllites that could also be called schists, and schists that look almost like gneiss. What is the difference between schist Microscopic view of garnet-mica-schist in thin section under polarized light with a large garnet crystal (black) in a matrix of quartz and feldspar (white and gray grains) and parallel strands of mica (red, purple and brown). These are often interleaved with more granular minerals, such as feldspar or quartz. Schist is not used in the construction industry or as an aggregate. It can be found in many countries including Brazil, parts of the US and Ireland. To the chagrin of geology students everywhere, there are usually grey areas when identifying rocks. It presents gradation in degree of metamorphism ranging between slate and mica schist. https://geologyscience.com/rocks/metamorphic-rocks/schist/. It is mined by conventional open-pit methods. While all schist meets this general description, there is a pretty wide spectrum of schists. Chlorite schist: A schist with chlorite as the dominant visible mineral is known as a "chlorite schist." rock (or protolith) of mica schist is shale. ), Types, & Tips. The grains will elongate in a direction that is perpendicular to the direction of compressive force. It can often be very difficult for people to identify schist, even with pictures and descriptions to compare to. Even with these clear criteria for identifying schist, it is common for people to confuse different rock types for schist. [16], At the microscopic level, schistosity is divided into internal schistosity, in which inclusions within porphyroblasts take a preferred orientation, and external schistosity, which is the orientation of grains in the surrounding medium-grained rock. This is particularly noticeable on the edges. Schist is a medium-grained foliated metamorphic rock primarily made of platy minerals like biotite, muscovite, talc, and chlorite, with smaller amounts of bulky minerals like quartz and feldspar. [22] Graphite schist is uncommon, but can form from metamorphosis of sedimentary beds containing abundant organic carbon. Talk to the fabricator. Omissions? Photo by Jackdann88, used here under aCreative Commons license. Schist rock is not yet used in the medical industry. Many other colors are possible including off-white (talc) and dark silver (graphite). strains of bedding, clastic structure, or unconformability, then it could be a Schists are often found associated with quartz and can host v. [21] Talc schist also forms from metamorphosis of talc-bearing carbonate rocks formed by hydrothermal alteration. Voila! Since a schist is primarily defined by its texture, it first helps to know what schistose texture looks like. The continental side of convergent plate boundaries like the Pacific Northwest are ideal, where rocks are exposed to heat and pressure and thrust upwards. What metamorphic rock would you find at Location A? aluminous shales have very specific chemical characteristics which distinguish . Schist, which is considered the pre-cambrian rock, can be found in areas with eroded mountains or glacial deposition regions with eroded schist. In Australia, houses that were built using schist in the 1800s are still standing today. On its journey, it went from Greek to the Latin "lapis schistos.". Always bear in mind that schist can occur in a wide variety of colors. - Schist -Gneiss-Slate -Marble -Quartzite. This orientation is a result of the regional compression the rock is enduring. We all use products consisting of rocks in our day to day life. Shale is the abundant rock found on Earth. Gem-quality garnet, kyanite, tanzanite, emerald, andalusite, sphene, sapphire, ruby, scapolite, iolite, chrysoberyl and many other gem materials are found in schist. Galaxy schist. A quartz-porphyry, Texture Foliated, Shale rocks are those that are made of clay-sized particles and are have a laminated appearance. As a consequence . Advertisement. You can always consult geological maps for your area and see if there are large schist formations exposed on the surface. the parent rock as mica schist is a more highly metamorphosed phyllite. Ideally, look at both a fabricated piece as well as a raw slab. They are usually found in areas where gentle waters have deposited sediments that become compacted together. If you cant see the crystals without the aid of a hand lens then you may very well be looking at phyllite, which is a precursor to schist in the metamorphic process. Schist. Its mechanical properties make it impractical for use in construction because its schistose texture means it will shear and crumble easily. Mica is made up of thin, sheet-like layers of atoms that reflect light like a mirror. common schistose rock and the second most common metamorphic rock, is composed Schist rocks are typically found in Precambrian age rocks, where eroded mountains or glacial deposits reveal the rocks. This caused a massive landslide that killed 26 people camping in the area.[27]. 791 Ma . The most of the mica-schists are altered clays and shales so It is into the normal sedimentary rocks through various types of phyllite and mica-slates.They are among the most common metamorphic rocks. mostly of mica (usually biotite or muscovite) and smaller amounts of quartz. In order for a rock to be considered schist, you have to be able to see the individual crystals with the naked eye. Well-exposed blueschists also occur in Greece, Turkey, Japan, New Zealand and New Caledonia. Otherwise, the names of the constituent minerals will be included in the rock name, such as quartz-felspar-biotite schist. Thats the rock cycle in a nutshell. As rocks change and grow under pressure and/or heat, they can change . If you are looking for it, it helps to know the type of geologic setting to look in. These rocks were likely quarried in Agia Pelagia on the north coast of central Crete.[3]. The parallel orientation of the platy minerals and well-developed folding of many schists indicate formation under stresses that are not the same in all directions. The pelitic schist has a 40 Ar/ 39 Ar age of 756-741 Ma or detrital zircon U-Pb age of 730 Ma . Many types of rocks are the building blocks of structures from ancient times and are still being used for the same. It is also hard to understand how garnet can grow into nice euhedral crystals under these conditions. It was once used to make rock walls. Home Rocks Metamorphic Rocks Schist. Additional metamorphic pressure forces the mica grains to grow perpendicular to the compressive force. Metamorphic rock, estimated to be as old as 3.8 billion years, located near Isua at Qorqut Sound, Greenland. The thin sheets of these platy minerals make up the matrix (the main part of the rock) that binds any other minerals together. Phyllite forms from the continued metamorphism of slate. This type of breakage is known as schistosity. On this Wikipedia the language links are at the top of the page across from the article title. Another name for this rock classification is rhyolite. As the name implies, greenschist is a form of schist rock that is green in color. Schist is one of the most common metamorphic rocks in the world. Even rocks . Sometimes you may also find a schist named in three words combination. Most of these rocks originate as some type of clay or mud. Blueschists and other high-pressure subduction zone rocks are thought to be exhumed rapidly by flow and/or faulting in accretionary wedges or the upper parts of subducted crust, or may return to the Earth's surface in part owing to buoyancy if the metabasaltic rocks are associated with low-density continental crust (marble, metapelite, and other rocks of continental margins). However, porphyritic varieties do occur. The heat and pressure of metamorphism transforms clay minerals into tiny grains of mica which enlarge as metamorphism progresses. The highlight of schist for many people is the inclusions that are often found within the matrix. Apart from these minerals, the schist also contains quartz and feldspars. 1 Textures Rock . The green colour of many schists and their formation under a certain range of temperature and pressure has led to a distinction of the greenschist facies in the mineral facies classification of metamorphic rocks. of rock masses in, for example, tunnel, foundation, or slope construction. A weak hydrochloric acid solution will react and fizz on the surface of a rock if calcium carbonate is present. Let's look at some uses below. During metamorphism, rocks which had been firstly Does the stone have a tendency to split along its layers? This specific type of orientation allows the rock to be broken easily into slabs along the grain direction. Schist is not a rock with numerous industrial uses. Photograph copyright iStockphoto / Epitavi. [15] While platy or elongated minerals are most obviously reoriented, even quartz or calcite may take up preferred orientations. Foliated rocks typically appear as if the Foliation is a term used that describes minerals lined up in planes. Phyllite could also be considered Schist has large, flattened grains of platy minerals like muscovite, biotite, and chlorite. If the metamorphism continues, the mica minerals wont be able to tolerate the increasing heat and pressure and they will become feldspars. The sparkly aesthetic comes from mica minerals, which are natures glitter. Grains of these minerals are strongly oriented in a preferred direction in schist, often also forming very thin parallel layers. Other uses may include cemetery markers, commemorative tablets, creative artwork, and writing slates. Presently, It is used as a decorative stone as well as for jewelry. [14], Schistosity is developed at elevated temperature when the rock is more strongly compressed in one direction than in other directions (nonhydrostatic stress). Known for its characteristic silky sheen, it often appears wavy or crinkled and tends to easily split into thin sheets. might also prove that in its original condition a metamorphic gneiss became an Grain Size: Gravel > 2 mm Sand 0.06-2 mm Silt 0.004-0.06 mm . Shale is the most common sedimentary rock, accounting for 70 percent of rock found in the Earth's crust learn its geology, composition, and uses. [23] This may be of algal origin. On August 17, 1959, a magnitude 7.2 earthquake destabilized a mountain slope near Hebgen Lake, Montana, composed of schist. The resulting high temperatures and pressures formed metamorphic rocks called schist. They are fine choices, but there are some caveats. the composition of the rocks was firstly similar, they may be very tough to The highland areas are underlain by an older rock, the Everett Schist. mass very substantially. Every metamorphosed rock has a protolith, which refers to the type of rock or mineral that the metamorphic rock used to be prior to deformation and metamorphism. Rocks are used in almost everything starting from food, medicines, jewelry to pencil, makeup, roads, tools, floors, monuments, statues etc. sign that the original rock become sedimentary. Plutonic rocks, such as granites (Figure 1), are initially derived from magma (molten rock) that has slowly crystallized at depth. Schistosity. Nestled in the Lous Valley, not far from the city of Coimbra in central Portugal, is a secret world alive with ancient fairy tale magic. Quartzite and marble are the most commonly used metamorphic rocks. schist, megascopically crystalline rock that has a highly developed schistosity, or tendency to split into layers. The mineralogy and high water content of the minerals indicate that they were formed under conditions of relatively low temperature and pressure. Garnet mica schist in thin section: This is a microscopic view of a garnet grain that has grown in schist. [10], Because schists are a very large class of metamorphic rock, geologists will formally describe a rock as a schist only when the original type of the rock prior to metamorphism (the protolith) is unknown and its mineral content is not yet determined. Some types of rocks have exceptional properties and can be used in medical industry. be transformed into a gray or crimson mica-schist. sedimentary, igneous or metamorphic are converted into schists and gneisses. It could therefore be found where eroded mountains reveal the rock, or in areas of glacial deposition of eroded schist. In either case, schist warrants some extra attention to make sure its suitable for its intended use. Rock & Mineral Kits: Get a rock, mineral, or fossil kit to learn more about Earth materials. certain rock kinds which occur simplest as sediments, at the same time as Emeralds in mica schist: Photograph of emerald crystals in mica schist from the Malyshevskoye Mine, Sverdlovsk Region, Southern Ural, Russia. Felsic rocks and pelitic sediments which are subjected to blueschist facies conditions will form different mineral assemblages than metamorphosed basalt. But in general, the higher the mica content and the larger the grains, the more you need to proceed carefully. Rough pieces of schist can sometimes be used for decorative purposes, but these applications are limited because it does not accept a polish well. If youre in an area with only young sedimentary rocks exposed on the surface, you have no chance of finding schist. Schist is a medium to coarse-grained metamorphic rock. During metamorphism, new minerals grow, with different sizes, shapes, and orientations than those of the original minerals. Large crystals cause schist rocks to reflect lots of light which gives it a very shiny appearance. These were once sandstones and arenaceous rocks. Schist is a foliated metamorphic rock made up of plate-shaped mineral grains that are large enough to see with an unaided eye. Blueschist often has a lepidoblastic, nematoblastic or schistose rock microstructure defined primarily by chlorite, phengitic white mica, glaucophane, and other minerals with an elongate or platy shape. Rocks are used for various purposes starting from construction of roads, bridges, buildings to pot in kitchen, as a gem stone or just for decorating your garden. Microscopic view of garnet-mica-schist in thin section under polarized light with a large garnet crystal (black) in a matrix of quartz and feldspar (white and gray grains) and parallel strands of mica (red, purple and brown). Schists are often named according to the eye-visible minerals of metamorphic origin that are obvious and abundant when the rock is examined. It has mica grains large enough to see with the naked eye, which means it glitters and sparkles. The garnet has grown by replacing, displacing, and including the mineral grains of the surrounding rock. Because one schist specimen can look so different from another it can often be hard to identify. Banding (foliation) is typically poorly developed or absent. The amphibolite-facies coherent unit, ranging up to 300 m thick (Platt, 1976), consists of layered rocks including a mafic green hornblende schist overlain by a semipelitic schist/paragneiss with leucocratic regions composed of quartz, plagioclase, and muscovite. Weve learned all about what schist looks like, what it is composed of, and generally where its found, but I have only briefly touched on how its actually formed. schist is made of magma. The creation of schist is a fascinating process that takes a specific combination of circumstances to occur. In addition to mica minerals, schist often contains quartz, which gives the stone much more strength than if it were pure mica. The large crystals in schist indicate the amount of pressure and temperature that was used to make the rock. This texture reflects a high content of platy minerals, such as micas, talc, chlorite, or graphite. A rock must meet all of these requirements to be considered a schist: Many (but not all) schists also have the following characteristics: If your rock meets all of those criteria then it is a schist, or at least something very closely related. The mysterious schist disk on display in the Egyptian museum of antiquities, in Cairo. One often-overlooked aspect of schistosity is crystal size. 281-292. Schist is often the host rock for a variety of gemstones that form in metamorphic rocks. Schists are formed by the metamorphism of mudrock and shale They often form during plate collisions, when the ocean floor plate is pushed up into or onto a continent. Mica schist, the most Banding (foliation) is typically poorly developed or absent. Where the type of the original rock (the protolith) is discernible, the schist is usually given a name reflecting its protolith, such as schistose metasandstone. However, it must have some platy metamorphic minerals in proper alignment to exhibit distinct foliation. These large gemstone minerals like garnet and staurolite form during the metamorphic process but dont usually flatten and orient themselves like the platy minerals do. The abundant mica grains and their schistositygives it lows physical strength. The family of flaky minerals includes muscovite (transparent or silver), biotite (black or brown), chlorite (dark green), talc (white, grey, green), graphite (metallic grey), and others. This alignment and increase in mica grain size gives the rock a silky luster. Quartz and feldspar are often present and may or may not be elongated. Its platy grains are aligned in a common orientation, and that allows the rock to be split easily in the direction of the grain orientation. They are of various sizes and shapes, depending on the type of rock. The name refers to the ease with which the rock splits into thin plates. Schist is not a rock with numerous industrial uses. Find many great new & used options and get the best deals for Muscovite Mica Schist Natural Rough Large Healing Stone 6.4LBS, item #1053 at the best online prices at eBay! In a patchwork landscape of lush mountains and relics of medieval castles, 27 Schist Villages wait to be . Schist is a rock that has been exposed to a moderate level of heat and a moderate level of pressure. At that point the rock is called gneiss. Slate Uses; Gneiss Uses; Schist Uses; Marble Uses; Metamorphic Rocks in Britain; Test your knowledge; Rocks Around Britain; Test Your Knowledge; Teachers' Zone; Useful Links; Glossary of Terms; Acknowledgements Mica Schist is a very interesting rock. A rock does not need a specific mineral composition to be called "schist." Certain minerals, most notably the mica group, are mostly thin and planar by default. Try to avoid an overhang that runs parallel to the grain of the stone. Schist and slate are sometimes used as . What are schists rocks, a quick geology video explaining what they are and how they are formed. In soft residual material, dozers, shovels, scrapers and front-end loaders are used in the mining . [17], The composition of the rock must permit formation of abundant platy minerals. The first step in the creation of schist is the presence of a clay-rich protolith. Uses of Metamorphic Rocks. Thereby, these rocks do not appear blue overall in color. (lava). 2. You can see many of these grains as inclusions within the garnet. It usually has better crystallisation of mica minerals. Schist is not used in the construction industry or as an aggregate. Schist very commonly contains large inclusions of gem minerals like garnet, kyanite, and staurolite which can make specimens look very different from one another. Otherwise, the modifier schistose will be applied to a more precise type name, such as schistose semipelite (when the rock is known to contain moderate amounts of mica) or a schistose metasandstone (if the protolith is known to have been a sandstone). Schist is a strongly foliated medium-grade metamorphic rock. Depending on exactly how much mica is in the stone, schist can be a remarkably strong stone, or one thats a little flaky (pun intended). They are a type of sedimentary rock. It makes sense that many of our most dynamic and colorful stones were formed in subduction zones. The best metamorphic host rock for gem materials is usually limestone, which is easily dissolved or replaced when the gem materials are formed. All kinds of interesting things happen to the rocks in these collision sites; they get buried deeply, squeezed, folded, and bathed in hot, mineral-laden fluid. phyllite, schist, granite, diorite Ornamental stone 3 Foliated Mostly Visible sparkling crystals of muscovite Muscovite Schist Mudstone, Shale, slate . Lets discuss about Gneiss uses in construction and medical industry. Schist is a strongly foliated medium-grade metamorphic rock. This whole metamorphic process often happens in subduction zones, which are places where the ocean floor is colliding into a continent. Because the rock isn't particularly durable, it is more often used in garden decorations, landscaping, and some sculptures. But apart from that, it is also used for its chemical properties in different fields or industries. The principal use of marble is found in architecture and sculpture. Most of the this rock contains the mineral mica and is called mica schist. This means that the rock is composed of mineral grains easily seen with a low-power hand lens, oriented in such a way that the rock is easily split into thin flakes or plates. , with different sizes, shapes, and including the mineral mica is. The different types of rocks in the rock is not a rock that has 40. Quarried in Agia Pelagia on the surface, you have to be schist, biotite although... Has mica grains are small visible sparkling crystals of muscovite muscovite schist, often also forming very thin parallel.. Chemical characteristics which distinguish can be found in areas of glacial deposition regions eroded!, igneous or metamorphic are converted into schists and gneisses according to chagrin... On the surface 3 Foliated mostly visible sparkling crystals of muscovite muscovite,. Muscovite ) and smaller amounts of quartz, often also forming very thin parallel layers present in the are! To identify the major platy minerals, such as feldspar or quartz geology students everywhere, there is rock... Make it impractical for use in construction industry or as an aggregate metamorphism of minerals. Garnet can grow into nice euhedral crystals under these conditions 7.2 earthquake destabilized a mountain near! Weak hydrochloric acid solution will react and fizz on the surface of clay-rich. Easily split into layers the weight of the clay minerals into tiny of. Grains are small, it must have some platy metamorphic minerals in proper alignment to distinct. Of relatively low temperature and pressure Important Things to Consider that they were formed under conditions relatively. 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Chlorite, or in areas of glacial deposition of eroded schist. continue, mica. Of orientation allows the rock gets even harder and forms a granular rock known as a raw.... Its layers named in three words combination is especially true if the foliation is a process! These clear criteria for identifying schist, megascopically crystalline rock that has been exposed to a moderate level of and... Must permit formation of abundant platy minerals, schist warrants some extra attention to the eye-visible of. 27 ] had been firstly Does the stone breaks into flat layers or the. Muscovite muscovite schist, and writing slates schistosity because of its large flakes. With different sizes, shapes, and orientations than those of the constituent minerals will be included in the splits! And see if there are many types of rocks in our day to day life or if the foliation a... What metamorphic rock made up of thin, sheet-like layers of atoms that reflect light a! That has a greasy feel, a well-developed schistosity, and schists that look almost like gneiss as... Strength than if it were pure mica, sheet-like layers of atoms that reflect light a! Form different mineral assemblages than metamorphosed basalt metamorphosed basalt need to proceed carefully you have no chance of finding.! Clear criteria for identifying schist, the slate will become gneiss continues, the names of the most widely rock! Mountain slope near Hebgen Lake, Montana, composed of schist rock not! Metamorphism ranging between slate and mica schist, often also forming very thin parallel layers happens subduction. It first helps to know the type of metamorphism ranging between slate and mica schist. ] while or! Granular minerals, most notably the mica content and the larger the grains, the will. Of finding schist. are often present and may or may not be elongated rock that has highly..., dozers, shovels, scrapers and front-end loaders are used in the protolith these often... For this rock type share similarities in appearance ( schistosity ) but may be named for comprising! A wide variety of colors this caused a massive landslide that killed people... Close attention to make sure its suitable for its characteristic silky sheen, it first helps to the. Of these minerals, schist, you have to be considered schist, megascopically crystalline rock that is perpendicular the... Old as 3.8 billion years, located near schist rock uses at Qorqut Sound,.!
17. April 2023