Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of biotite is as below...

Miascite :: Miascite (n.) A granitoid rock containing feldspar, biotite, elaeolite, and sodalite..

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

Picrite :: Picrite (n.) A dark green igneous rock, consisting largely of chrysolite, with hornblende, augite, biotite, etc..

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