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micas

  • plural
    of mica.
    mica
    noun
    any member of a group of minerals, hydrous silicates of aluminum with other bases, chiefly potassium, magnesium, iron, and lithium, that separate readily into thin, tough, often transparent, and usually elastic laminae; isinglass.

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The quartz crystals show no alignment, but the micas are all aligned, indicating that there was directional pressure during regional metamorphism of this rock.

From Textbooks ● Jan. 1, 2015

On the other hand, most clay minerals are only stable up to about 150° or 200°C; above that, they transform into micas.

From Textbooks ● Jan. 1, 2015

Phyllite is similar to slate, but has typically been heated to a higher temperature; the micas have grown larger and are visible as a sheen on the surface.

From Textbooks ● Jan. 1, 2015

Most gneiss has little or no mica because it forms at temperatures higher than those under which micas are stable.

From Textbooks ● Jan. 1, 2015

The specific gravity of biotite is, as a rule, higher than that of other micas, varying from 2.7 to 3.1 according to the amount of iron present.

From Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7 "Bible" to "Bisectrix" by Various

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