One of the mysteries of the English language finally explained.
A schist of a greenish colour; specifically (usually in form greenschist) a schistose or foliose rock with a greenish colour resulting from an abundance of chlorite, epidote, and albite, and formed by metamorphism of basic igneous rocks.
Early 19th century. From green + schist.
green schist/ˈɡriːn ˌʃɪst/
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