Roger Weller, geology instructor
[email protected] copyright 2010-R.Weller
biotite book-2
Biotite is K(Mg,Fe)3AlSi3O10(OH)2
Biotite is also known as black mica.
It can be peeled off of a large crystal in thin layers
but with
more difficulty
than peeling muscovite (white mica). Biotite does not have
economic value
because
it lacks the transparency and electrical insulating properties
found in
muscovite.
mica
2188
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non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.