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Biotite

//ˈbaɪəˌtaɪt// noun

Definitions

Noun
  1. 1
    A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron. countable, uncountable
  2. 2
    dark brown to black mica found in igneous and metamorphic rock wordnet

Etymology

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.

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