from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A monoclinic-prismatic mineral containing aluminum, hydrogen, iron, magnesium, oxygen, and silicon.
from the GNU version of the Collaborative International Dictionary of English
- n. a greenish gray or black silicate of iron and aluminum.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a greenish grey or black silicate of iron and aluminum
Iron likewise combines with a considerable variety of substances other than oxygen; and some of these compounds, as for instance iron carbonate (siderite), iron silicate (chamosite, glauconite, etc.), and iron sulphide (pyrite), are locally mined as iron ores.