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I think you are confused. Schist is a strongly foliated medium-grade metamorphic rock. One of the most important tests for identifying mineral specimens is the Mohs Hardness Test. The test is useful because most specimens of a given mineral are very close to the same hardness. Talc, PPL Talc, Plane Polars. Schist is a medium grade metamorphic rock with medium to large, flat, sheet like grains in a preferred orientation. The hardness scale is a way to check for hardness of minerals using minerals as examples. Talc. Color variations include amethyst, smoky, rose, and milky quartz. The streak of Schist … This test compares the resistance of a mineral to being scratched by ten reference minerals known as the Mohs Hardness Scale (see table at left). What is Schist? The streak of Schist is white whereas its fracture is conchoidal. It goes from a hardness of 1 for talc to 10 for diamond. The softest of the common minerals, it can be scratched with a fingernail. Mohs' scale of mineral hardness is named after Friedrich Mohs, a mineralogist.Mohs scale is ordered by hardness, determined by which minerals can scratch other minerals.. Talc is known for being the softest mineral on earth. Talc in Hand Sample. Talc schist; Tourmalinite; Ultramylonite (granitic) Ultramylonite (mafic) Andalusite schist The word schist is derived from the Greek word schízein meaning "to split", which is a reference to the ease with which schists can be split along the plane in which the platy minerals lie. Greasy or soapy feel. The hardness of Schist is 3.5-4 whereas its compressive strength is Not Available. Schist has medium to large, flat, sheet-like grains in a preferred orientation (nearby grains are roughly parallel). Commercial uses Talc in Thin Section Thin Section GigaPans. It is defined by having more than 50% platy and elongated minerals (such as micas or talc), often finely interleaved with quartz and feldspar. Schist is available in black, blue, brown, dark brown, green, grey, silver colors. Schist is a foliated metamorphic rock made up of plate-shaped mineral grains that are large enough to see with an unaided eye. Electronics and glassmaking. Some metamorphic rocks. What is Mohs Hardness Scale? According to the scale, Talc is the softest: it can be scratched by all other materials. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. Talc in plane polarized light. Streak is the color of rock when it is crushed or powdered. talc - schist known for being the softest mineral on earth, talc is a clay mineral composed of hydrated magnesium silicate with the chemical ... from white to grey or green and it has a distinctly greasy feel. Rocks are made up of one or more minerals. It is number 1 on the Mohs hardness scale, and can be easily scratched by a fingernail.Talc is not commonly seen in collections, as it is usually uninteresting and fairly common, although a few deeply colored and … Hardness 1. Talc is a soft mineral, measuring about 1 on the Mohs hardness scale. This sample is on display at the Smithsonian Museum of Natural History. Talc (Mg Silicate) Luster nonmetallic, pearly to greasy or dull. Usually pale green, also white to silver-white or gray. Streak white. I’ve not heard of such a scale nor does it make sense. It is described as actinolite-talc schist and its source is the Catalina Schist, Santa Catalina Island, California. Platy. Gypsum is harder: it can scratch talc but not calcite, which is even harder. Talc. Talc, plane polars Talc, crossed polars Talc tremolite schist, plane polars Talc tremolite schist, crossed polars. quartzite, schist, gneiss, veins. Rocks with hardness 1-3 are soft rocks from 3-6 are medium hardness rocks and 6-10 are hard rocks. It is characterized by an abundance of platy or elongated minerals (micas, chlorite, talc, graphite, amphiboles) in a preferred orientation.Varieties of this rock type share similarities in appearance (schistosity) but may be highly variable in composition. It usually forms on a continental side of a convergent plate boundary where sedimentary rocks, such as shales and mudstones, have been subjected to compressive forces, heat, and chemical activity. To 10 for diamond white whereas its compressive strength is not Available does. Foliated metamorphic rock with medium to large, flat, sheet-like grains in a preferred talc schist hardness... Make sense a preferred orientation about 1 on the Mohs hardness scale, also white to silver-white or.. Are large enough to see with an unaided eye for talc to for... 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