from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A dark-brown or dark-green to black mica, K(Mg,Fe)3(Al,Fe)Si3O10(OH)2, found in igneous and metamorphic rocks.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.
from the GNU version of the Collaborative International Dictionary of English
- n. Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See mica.
from The Century Dictionary and Cyclopedia
- n. An important member of the mica group of minerals. See mica.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. dark brown to black mica found in igneous and metamorphic rock
After Jean Baptiste Biot (1774-1862), French physicist.(American Heritage® Dictionary of the English Language, Fourth Edition)
Biot + -ite, named by J.F.L. Hausmann in 1847 in honour of the French physicist Jean-Baptiste Biot, who, in 1816, researched the optical properties of mica, discovering many unique properties. (Wiktionary)