biotite

From Biot +‎ -ite, named by J.F.L. Hausmann in 1847 in honour of the French physicist Jean-Baptiste Biot, who, in 1816, researched the optical properties of mica, discovering many unique properties.

• IPA^(key): /ˈbaɪəˌtaɪt/

biotite (countable and uncountable, plural biotites)

1. (mineralogy) A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.

• David Barthelmy (1997–2025), “Biotite”, in Webmineral Mineralogy Database.
• “biotite”, in Mindat.org‎^[1], Hudson Institute of Mineralogy, 2000–2025.

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biotite f (plural biotites)

1. (mineralogy) biotite

• “biotite”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

biotite f (plural biotiti)

1. (mineralogy) biotite

• obietti