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from Wikipedia, the free encyclopedia


The mica group of sheet silicate minerals includes several closely related materials having highly perfect basal cleavage.

All are monoclinic with a tendency towards pseudo-hexagonal crystals and are similar in chemical composition.

The highly perfect cleavage, which is the most prominent characteristic of mica, is explained by the hexagonal sheet-like arrangement of its atoms.

Note:   The above text is excerpted from the Wikipedia article "Mica", which has been released under the GNU Free Documentation License.
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October 13, 2015

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