Pronunciation: (sid'u-rīt"), [key]
1. Also called chalybite. a common mineral, iron carbonate, FeCO3, usually occurring in yellowish to deep-brown cleavable masses: a minor ore of iron.
2. a meteorite consisting almost entirely of metallic minerals.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.