SCHIST
Schist
Schist is a medium-grade metamorphic rock with medium to large grains of mica flakes in a preferred orientation . Geological foliation with medium to large grained mica flakes in a preferred sheetlike orientation is called schistosity. It is defined by having more than 50% platy and elongated minerals, often finely interleaved with quartz and feldspar. It has a preponderance of lamellar minerals such as 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 has larger ...The above text is a snippet from Wikipedia: Schist
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schist
Noun
- Any crystalline rock having a foliated structure and hence admitting of ready division into slabs or slates.
The above text is a snippet from Wiktionary: schist
and as such is available under the Creative Commons Attribution/Share-Alike License.