BIOTITE

biotite

(noun) dark brown to black mica found in igneous and metamorphic rock

Source: WordNet® 3.1

Etymology

Noun

biotite (countable and uncountable, plural biotites)

(mineral) A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.

Source: Wiktionary

Bi"o*tite, n. Etym: [From Biot, a French naturalist.] (Min.)

Definition: Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See Mica.

Source: Webster’s Unabridged Dictionary 1913 Edition

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