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MUSCOVITE #3B













    Sample in alkali granite
    Back to Muscovite #1
             Back to #3A
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A mica mineral. This sample shows well the basal cleavage and the tendency toward forming 6-sided crystals when the crystal can grow freely. This specimen comes from a pegmatite, a coarse grained granitic rock.
     Muscovite occurs occasionally in felsic igneous rocks. It is often recognized because light flashes sharply off its cleavages faces, almost like light off a mirror.

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Last Update: 8/17/00

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