Found 2 items, similar to Biotite.
English → English (WordNet) Definition: biotite biotite n : dark brown to black mica found in igneous and metamorphic rock
English → English (gcide) Definition: Biotite Biotite \Bi"o*tite\, n. [From Biot, a French naturalist.] (Min.) Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See Mica. [1913 Webster]