siderite

An ore of iron, FeCO₃.

A meteorite consisting mainly of iron and nickel.

A meteorite consisting essentially of nickeliferous metallic iron. See meteorite.

The lodestone.

Native iron protocarbonate, a mineral of a yellowish or brownish color, crystallizing in the rhombohedral system with perfect rhombohedral cleavage.

Carbonate of iron, an important ore of iron occuring generally in cleavable masses, but also in rhombohedral crystals. It is of a light yellowish brown color. Called also sparry iron, spathic iron.

A meteorite consisting solely of metallic iron.

An indigo-blue variety of quartz.

Formerly, magnetic iron ore, or loadstone.