from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A black iron-potash mica, usually found in granitic rocks in small six-sided tables, or as an aggregation of minute opaque scales.
from the GNU version of the Collaborative International Dictionary of English
- n. An iron-potash mica, of a raven-black color, usually found in granitic rocks in small six-sided tables, or as an aggregation of minute opaque scales. See mica.
from The Century Dictionary and Cyclopedia
- n. A species of the mica group (see mica), of a deep-black color, usually occurring in small, rather inelastic scales. It contains a large amount of iron.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a mica that is a biotite containing iron
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