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biotite

Noun

bi=o=tite

WORDNET DICTIONARY

biotite(n = noun.substance) Array - dark brown to black mica found in igneous and metamorphic rock; Array

is a kind of isinglass, mica

Derived form adjective biotitic₁

biotite, n. [From Biot, a French naturalist.].

Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See Mica. [1913 Webster]

biotite, n. Mineral. a black, dark brown, or green micaceous mineral occurring as a constituent of metamorphic and igneous rocks.

Etymology

J. B. Biot, Fr. physicist d. 1862

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