Keilite

Keilite
Keilite
General
Category	Sulfides
Formula; (repeating unit)	(Fe2+,Mg)S
Strunz classification	2/C.15-15
Dana classification	2.8.1.9
Crystal system	Isometric
Crystal class	Hexoctahedral
Space group	Fm3m (No. 225)
Unit cell	a=5.1717(18)Å
Identification
Formula mass	81.91 gm
Colour	Grey
Crystal habit	Microscopic crystals
Cleavage	Distinct/Good
Tenacity	Brittle
Luster	Metallic
Diaphaneity	Opaque
Specific gravity	3.958
Density	3.958

Keilite is an iron-magnesium sulfide mineral with the chemical formula (Fe,Mg)S) that is found in enstatite chondrites.^[1] Keilite is the iron-dominant analog of niningerite.^[2]^[3] Keilite is named after Klaus Keil (born 1934).^[2]

Occurrences[]

Examples of keilite occurrences are enstatite chondrites and the Zakłodzie meteorite.^[3] 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 (diapthoresis) to take place.^[4]

References[]

^ "Keilite Mineral Data". WebMineral. Retrieved 15 February 2021.
^ Jump up to: ^a ^b "Keilite" (PDF). Handbook of Mineralogy. Retrieved 15 February 2021.
^ Jump up to: ^a ^b Shimizu M, Yoshida H, and Mandarino JA. "The New Mineral Species Keilite, (Fe,Mg)S, The Iron-Dominant Analogue of Niningerite" (PDF). The Canadian Mineralogist. 40: 1687–1692.CS1 maint: multiple names: authors list (link)
^ Keil, Klaus (30 April 2007). "Occurrence and origin of keilite, (Fe>0.5,Mg<0.5)S, in enstatite chondrite impact-melt rocks and impact-melt breccias". Chemie der Erde - Geochemistry. 67 (1): 37–54. doi:10.1016/j.chemer.2006.05.002.

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[1] "Keilite Mineral Data". WebMineral. Retrieved 15 February 2021.

[:0-2] Jump up to: ^a ^b "Keilite" (PDF). Handbook of Mineralogy. Retrieved 15 February 2021.

[:1-3] Jump up to: ^a ^b Shimizu M, Yoshida H, and Mandarino JA. "The New Mineral Species Keilite, (Fe,Mg)S, The Iron-Dominant Analogue of Niningerite" (PDF). The Canadian Mineralogist. 40: 1687–1692.CS1 maint: multiple names: authors list (link)

[Keil_2007-4] Keil, Klaus (30 April 2007). "Occurrence and origin of keilite, (Fe>0.5,Mg<0.5)S, in enstatite chondrite impact-melt rocks and impact-melt breccias". Chemie der Erde - Geochemistry. 67 (1): 37–54. doi:10.1016/j.chemer.2006.05.002.

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