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a talc-schist, which is a type of metamorphic rock. it is largely composed of the mineral talc and is thus rich in magnesium. it is produced by dynamo thermal metamorphism and metasomatism, which occurs in the areas where tectonic plates are subducted, changing rocks by heat and pressure, with influx
, a specific gravity of , and its luster is vitreous in crystallized varieties. color is white or none, though shades of gray, red, orange, yellow, green, blue, violet, brown, or even black can occur when the mineral is charged with impurities. calcite is transparent to opaque and may occasionally show...
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