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biotite
(redirected from Black mica)

    Also found in: Encyclopedia, Wikipedia 0.02 sec.
bi·o·tite  (b-tt)
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.]
bio·titic (-ttk) adj.
biotite [ˈbaɪəˌtaɪt]
n
(Earth Sciences / Minerals) a black or dark green mineral of the mica group, found in igneous and metamorphic rocks. Composition: hydrous magnesium iron potassium aluminium silicate. General formula: K(Mg,Fe)3(Al,Fe)Si3O10(OH)2. Crystal structure: monoclinic
biotitic  [ˌbaɪəˈtɪtɪk] adj
biotite  (b-tt)
A dark-brown or dark-green to black mica. Biotite is monoclinic and is found in igneous, metamorphic, and sedimentary rocks. Chemical formula: K(Mg,Fe)3(Al,Fe)Si3O10(OH)2.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.biotite - dark brown to black mica found in igneous and metamorphic rock
lepidomelane - a mica that is a biotite containing iron
isinglass, mica - any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
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