M.J. Hibbard
Biotite


Biotite   K(Mg,Fe)3(AlSi3O10)(OH)2    Monoclinic
o Pegmatite (magmatic) environment. (chapter 11)
- Perfect cleavage {001} developed in a fragment (1-2 mm) of biotite viewed with a low-power optical microscope. Color brightness is governed by thickness, in this case ranging from colorless (transparent) (thin edges on left), through light to dark browns (translucent) to black (opaque) (right).

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