biotite
Bi"o*tite, n. Etym: [From Biot, a French naturalist.] (Min.) Defn: Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See Mica.
Bi"o*tite, n. Etym: [From Biot, a French naturalist.] (Min.) Defn: Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See Mica.