Schist is a medium to coarse-grained metamorphic rock. It is usually silvery green to dark green and grey. It contains thin layers which may be wavey, it usually splits easily along these layers, but does not form platy sheets like slate.
The Open University
How was it formed?
Schists are formed by the metamorphism of mudrock and shale They often form during plate collisions, when the ocean floor plate is pushed up into or onto a continent. It is the mudrocks of the sea floor that get crunched up to form schist.
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