Schist

Schist is a medium-grade metamorphic rock with medium to large, flat, sheet-like grains in a preferred orientation.‎ It is defined by having more than 50% platy and elongated minerals, often finely interleaved with quartz and feldspar.‎ These lamellar minerals include micas, chlorite, talc, hornblende, graphite, and others.‎ Quartz often occurs in drawn-out grains to such an extent that a particular form called quartz schist is produced.‎ Schist is often garnetiferous.‎ Schist forms at a higher temperature and h

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