Troilite

Polished slab of nodule in an iron-nickel meteorite, showing bright metallic troilite rimming gray nickel iron alloy and in turn rimmed by brown schriebersite, surrounded by black graphite. Campo del Chaco meteorite, Chaco, Argentina. Field of view about 4 mm left to right. (Photo by W. Cordua.)

Formula: FeS Hexagonal

Description:

A rare sulfide generally found only in iron-nickel meteorites.

ST. CROIX COUNTY: Troilite formed nodules 3- 12 mm in diameter and filled veins in the iron-nickel meteorite found in the N 1/2 SW sec. 31 T.29N. R.17W, near Hammond. (Fisher, 1887).