noun
also shist ˈshist
( -s )
Etymology: French schiste, from Latin schistos, adjective, that splits easily, from Greek, divided, divisible, from schizein to split — more at shed
: a metamorphic crystalline rock having a closely foliated structure, admitting of division along approximately parallel planes, and differing from gneisses in containing no essential feldspar and usually in having finer laminations