Keilite: Properties and Occurrences

Keilite is an iron-magnesium sulfide mineral [chemical formula- (Fe, Mg)S)] that is found in enstatite chondrites. It is an isometric-hexoctahedral gray mineral containing calcium, chromium, iron, magnesium, manganese, sulfur, and zinc

It is the iron-dominant analog of niningerite. It is named after Klaus Keil (born 1934).

General Information

  • Formula: (Fe2+, Mg)S
  • Luster: Metallic
  • Crystal System: Isometric
  • Name: Named after Klaus Keil, Professor at the University of Hawaii, Honolulu, USA.

Fig: Keilite

Properties of Keilite

Keilite is an iron-magnesium sulfide mineral that is found in enstatite chondrites. It is the iron-dominant analog of niningerite. It is named after Klaus Keil.

  • Cleavage: None
  • Color: Gray.
  • Diaphaneity: Opaque
  • Habit: Microscopic Crystals – Crystals visible only with microscopes.
  • Luster: Metallic
  • Transparency: Opaque.

Occurrences – An accessory mineral in enstatite chondrite meteorites.

Examples of keilite occurrences are enstatite chondrites and the Zakłodzie meteorite. It appears to be confined to impact-melt influenced enstatite chondrites that were quenched. There are also some meteorites interpreted as impact-melt breccias that don’t contain keilite. This is explained as a deeper burial after impact, which slowed cooling and enabled retrograde reactions (diaphoresis) to take place.

Association: Niningerite, enstatite, kamacite, troilite.

 

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