Biotite | Wikipedia audio article
Channel: wikipedia tts
Date: 15/01/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Biotite


00:01:16 1 Properties
00:02:59 2 Occurrence
00:04:23 2.1 Glimmerite
00:04:41 3 Uses



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Speaking Rate: 0.8504274697606244
Voice name: en-GB-Wavenet-D


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SUMMARY
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Biotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula K(Mg,Fe)3AlSi3O10(F,OH)2. 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 end-members include siderophyllite. Biotite was named by J.F.L. Hausmann in 1847 in honor of the French physicist Jean-Baptiste Biot, who performed early research into the many optical properties of mica.Biotite is a sheet silicate. Iron, magnesium, aluminium, silicon, oxygen, and hydrogen form sheets that are weakly bound together by potassium ions. It is sometimes called "iron mica" because it is more iron-rich than phlogopite. It is also sometimes called "black mica" as opposed to "white mica" (muscovite) – both form in the same rocks, and in some instances side-by-side.