Origin of biotite
Related formsbi·o·tit·ic [bahy-uh-tit-ik] /ˌbaɪ əˈtɪt ɪk/, adjective
Examples from the Web for biotite
Muscovite and biotite may both occur in the same rock; in other cases only one of them is present.
The biotite is brown; the hornblende brown or greenish brown; the augite usually green.
Biotite, if present, is brown; epidote is yellow or colourless; rutile, apatite and quartz all occur with some frequency.
There is some sericite present, also magnetite, resulting from the decomposition of the biotite.The Long Labrador Trail|Dillon Wallace
Biotite occurs in some of these rocks, and melanite also is present.