BIOTITE

Biotite

Biotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula . More generally, it refers to the dark mica series, primarily a solid-solution series between the iron-endmember annite, and the magnesium-endmember phlogopite; more aluminous endmembers include siderophyllite. Biotite was 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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biotite

Noun

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


The above text is a snippet from Wiktionary: biotite
and as such is available under the Creative Commons Attribution/Share-Alike License.

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