Stock Photo - A sample of schist, a medium to coarse-grained, foliated, metamorphic rock typically containing muscovite, biotite, chlorite, and quartz. Feldspar, usually albite or oligoclase, also commonly occurs. Dated 20th Century

Stock Photo: A sample of schist, a medium to coarse-grained, foliated, metamorphic rock typically containing muscovite, biotite, chlorite, and quartz.

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