biotitic

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bi·o·tite

B0270700 (bī′ə-tīt′)n. A dark-brown or dark-green to black mica, K(Mg,Fe)3(Al,Fe)Si3O10(OH)2, found in igneous and metamorphic rocks.
[After Jean Baptiste Biot (1774-1862), French physicist.]
bi′o·tit′ic (-tĭt′ĭk) adj.
Thesaurus
Adj.1.biotitic - relating to or involving biotite