biotiten.
/ˈbʌɪətʌɪt/, U.S. /ˈbaɪəˌtaɪt/ Mineralogy.
A black, dark brown, or greenish black mineral of the mica group, occurring in many igneous and metamorphic rocks, typically as tabular hexagonal crystals.Biotite is an aluminosilicate of potassium and iron or magnesium, often containing other elements. Crystal system: monoclinic.
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the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > mica > biotite
biotite1848
manganophyllite1877
1848 Edinb. New Philos. Jrnl. 44 375 Biotite.
1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 21 The geological area of biotite.
1905 Nevada State Jrnl. 18 June 13/5 The ground mass showing biotite, altered to chloride, and exhibiting a fine crystalization.
1940 Science 10 May 449/2 When biotite alters to glauconite there is an expansion which takes place perpendicularly to the biotite cleavage.
1975 M. Hill Geol. Sierra Nevada v. 66 Feldspars rich in sodium, together with the dark mica, biotite.
2003 High Country News 3 Feb. 16/2 Fine veins of Indian culture break the smooth polish of Anjula's American surface, like biotite seaming through marble.
Derivatives
bioˈtitic adj. containing or consisting of biotite.
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1856 Q. Jrnl. Geol. Soc. 12 ii. 6 The porphyries are all quartziferous and euritic; the granitic and biotitic varieties are the most extensive.
1925 N. E. Odell in E. F. Norton et al. Fight for Everest: 1924 291 The gneiss itself shows an alternation of biotitic and felspathic bands.
2003 D. A. Young Mind over Magma xiv. 246 Microscopic study of the rock would yield additional information so that the rock could be more precisely depicted as biotitic hornblende-grano-monzonose!
This entry has been updated (OED Third Edition, November 2010; most recently modified version published online December 2021).
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