Siderite

Name:
Siderite
Detailed information:
The term siderite is also used for an iron alloy found in meteorites.

Chemistry name:	chalybite; spathic iron ore
M Formula:	FeCO3 (usually with some calcium, magnesium, or manganese)
Properties:
Gray, yellow, brown, green, white, or brownish-red mineral; vitreous inclining to pearly luster; white streak. D 3.83–3.88, Mohs hardness 3.5–4.
Occurrence:
U.S. (Vermont, Massachusetts, Connecticut, New York, North Carolina, Pennsylvania, Ohio), Europe.
Use:
An ore of iron, when high in manganese used in the manufacture of spiegeleisen.