mica schist the most common schistose rock and the second most common metamorphic rock is composed mostly of mica (usually biotite or muscovite) and smaller amounts of quartz. the original parent rock (or protolith) of mica schist is shale. phyllite could also be considered the parent rock as mica schist is a more highly metamorphosed phyllite.
schist (pronounced / ʃ ɪ s t / shist) is a medium-grade metamorphic rock formed from mudstone or shale. schist has medium to large flat sheet-like grains in a preferred orientation (nearby grains are roughly parallel). it is defined by having more than 50% platy and elongated minerals (such as micas or talc) often finely interleaved with quartz and feldspar.
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schist is a strongly foliated medium-grade metamorphic rock. 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.
schist as a gem material host rock. schist is often the host rock for a variety of gemstones that form in metamorphic rocks. gem-quality garnet kyanite tanzanite emerald andalusite sphene sapphire ruby scapolite iolite chrysoberyl and many other gem materials are found in schist.
schist (pronounced /ʃɪst/ shist) is a medium-grade metamorphic rock formed from mudstone or shale. schist has medium to large flat sheet-like grains in a preferred orientation (nearby grains are roughly parallel). it is defined by having more than 50% platy and elongated minerals (such as micas or talc) often finely interleaved with
schist schist is medium grade metamorphic rock formed by the metamorphosis of mudstone / shale or some types of igneous rock to a higher degree than slate i.e. it has been subjected to higher temperatures and pressures.the resulting foliation is coarser and more distinct than that of slate due to the higher degree of crystallisation of mica minerals ( biotite chlorite muscovite) forming