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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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Muscovite micas belong to the felsic silicate minerals.

From Textbooks ● Jan. 1, 2017

At 15 km to 20 km, larger micas form to produce schist, and at 20 km to 25 km amphibole, feldspar, and quartz form to produce gneiss.

From Textbooks ● Jan. 1, 2015

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

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

This was materially assisted by the weak lath shapes of the feldspar and the mobility of the micas.

From History and Comprehensive Description of Loudoun County, Virginia by James William Head

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