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brittle mica

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brittle mica [¦brid·əl ′mī·kə]
(mineralogy)
Hydrous sodium, calcium, magnesium, and aluminum silicates; a group of more or less related minerals that resemble true micas but cleave to brittle flakes and contain calcium as the essential constituent.


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True and brittle micas found in igneous and metamorphic rocks, hydrothermal alteration and ore deposits are described (interlayer-deficient micas are described in another volume, on clay minerals).
 
 
 
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