micas
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pluralof mica.plural
The grammatical form denoting more than one person, place, thing, or idea.
micanounany 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.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
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