Schist

Schist: Schist is a metamorphic rock that comes in almost infinite variety, but its main characteristic is hinted at in its name: schist comes from the ancient Greek for "split," through Latin and French.

It is medium grade metamorphic rock, formed by the metamorphosis of mudstone / shale, or some types of igneous rock, to a higher degree than slate, i.e. it has been subjected to higher temperatures and pressures. The resulting foliation is coarser and more distinct than that of slate due to the higher degree of crystallisation of mica minerals and often shows a complex folding patterns. There are many varieties of schist and they are named for the dominant mineral comprising the rock.

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