schist(redirected from Hornblend schist)
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Any of various medium-grained to coarse-grained metamorphic rocks composed of laminated, often flaky parallel layers of chiefly micaceous minerals.
[French schiste, from Latin (lapis) schistos, fissile (stone), a kind of iron ore, from Greek skhistos, split, divisible, from skhizein, to split; see skei- in Indo-European roots.]
schis′tose′ (shĭs′tōs′), schis′tous (-təs) adj.
(Geological Science) any metamorphic rock that can be split into thin layers because its micaceous minerals have become aligned in thin parallel bands
[C18: from French schiste, from Latin lapis schistos stone that may be split, from Greek skhizein to split]
any of a class of crystalline metamorphic rocks whose constituent mineral grains have a more or less parallel or foliated arrangement.
[1775–85; < New Latin schistus, Latin (lapis) schistos < Greek schistós divided, curdled, divisible, derivative of schízein to split, with -tos adj. suffix]
schis′tose, schis′tous, adj.
A metamorphic rock characterized by a very fine alignment of its minerals, which allows it to be easily split into flakes or slabs. Because schist often contains abundant mica, it usually has a shiny, gray appearance. See Table at rock.
A metamorphic rock rich in flattened, aligned minerals. It comes from slate and basalt.