- a common mineral, iron carbonate, FeCO3, usually occurring in yellowish to deep-brown cleavable masses: a minor ore of iron.
- a meteorite consisting almost entirely of metallic minerals.
- a pale yellow to brownish-black mineral consisting chiefly of iron carbonate in hexagonal crystalline form. It occurs mainly in ore veins and sedimentary rocks and is an important source of iron. Formula: FeCO 3
- a meteorite consisting principally of metallic iron
