Keilite
(Fe2+,Mg)SIMA symbol Ke[1] 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 Meteorite... Classification
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Keilite is an iron-magnesium sulfide mineral with the chemical formula (Fe,Mg)S) that is found in enstatite chondrites.[2] Keilite is the iron-dominant analog of niningerite.[3][4] Keilite is named after Klaus Keil (born 1934).[3]
Occurrences
Examples of keilite occurrences are enstatite chondrites and the Zakłodzie meteorite.[4] 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 do not contain keilite. This is explained as a deeper burial after impact, which slowed cooling and enabled retrograde reactions (diapthoresis) to take place.[5]
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ "Keilite Mineral Data". WebMineral. Retrieved 15 February 2021.
- ^ a b "Keilite" (PDF). Handbook of Mineralogy. Archived from the original (PDF) on 3 March 2016. Retrieved 15 February 2021.
- ^ a b Shimizu M, Yoshida H, Mandarino JA (2002). "The New Mineral Species Keilite, (Fe,Mg)S, The Iron-Dominant Analogue of Niningerite" (PDF). The Canadian Mineralogist. 40 (6): 1687–1692. doi:10.2113/gscanmin.40.6.1687. S2CID 93381076.
- ^ 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. Bibcode:2007ChEG...67...37K. doi:10.1016/j.chemer.2006.05.002.
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