Schist is a medium-grade, foliated metamorphic rock that consists of medium to large grains of micas, quartz, feldspars, and amphiboles. By definition, schists are composed of over fifty percent platy minerals. Schists can be further defined by the minerals that they contain. For example, a schist that contains garnet is called a garnet schist. The steep walls of Black Canyon of the Gunnison are composed partly of Precambrian schist.

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