from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A dark-green to black pyroxene mineral, (Ca,Na)(Mg,Fe,Al)(Si,Al)2O6, that contains large amounts of aluminum, iron, and magnesium.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A variety of pyroxene, usually of a black or dark green color, occurring in igneous rocks, such as basalt.
from the GNU version of the Collaborative International Dictionary of English
- n. A variety of pyroxene, usually of a black or dark green color, occurring in igneous rocks, such as basalt; -- also used instead of the general term pyroxene.
from The Century Dictionary and Cyclopedia
- n. The dark-green to black variety of pyroxene characteristic of basic eruptive rocks like basalt.
- n. The name of this member of the pyroxene group of silicate minerals is frequently used in petrography in composition with the name of any rock in which it occurs as a prominent or noteworthy constituent: as, augite-andesite, augite-syenite, augite-gneiss, etc.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. dark-green to black glassy mineral of the pyroxene group containing large amounts of aluminum and iron and magnesium
Latin augītis, a precious stone, from Greek augītēs, from augē, brightness.(American Heritage® Dictionary of the English Language, Fourth Edition)