We found 1 definitions of biotites from 1 different sources.
NounPlural: biotites |
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biotite - dark brown to black mica found in igneous and metamorphic rock | ||
isinglass, mica any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity |