What is "keilite"

n. (context mineralogy English) An isometric-hexoctahedral gray mineral containing calcium, chromium, iron, magnesium, manganese, sulfur, and zinc.

Keilite is an iron- magnesium sulfide mineral (chemical formula (Fe,Mg)S)) that is found in enstatite chondrites. Keilite is the iron-dominant analog of niningerite. Keilite is named after Klaus Keil (born 1934).