Chemistry:Hashemite (mineral)
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Hashemite | |
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![]() Hashemite from the Lisdan-Siwaga Fault, Hashem Region, Amman, Jordan | |
General | |
Category | Chromate minerals |
Formula (repeating unit) | Barium Chromate Ba(S,Cr)O4 |
Crystal system | Orthorhombic |
Identification | |
Color | Brown to yellow |
Cleavage | Perfect {001}, good {010} {100} |
Mohs scale hardness | 3.5 |
|re|er}} | Adamantine |
Diaphaneity | Translucent |
Specific gravity | 4.54 - 4.59 |
References | [1] |
Hashemite is a very rare barium chromate mineral[1] with the formula Ba(Cr,S)O4.[2] It is a representative of natural chromates - a relatively small and rare group of minerals. Hashemite is the barium-analogue of tarapacáite. It is also the chromium-analogue of baryte, and belongs to the baryte group of minerals. Hashemite is stoichiometrically similar to crocoite and chromatite.[1] Hashemite is orthorhombic, with space group Pnma. I was found together with chromium-bearing ettringite and an apatite group mineral in the Hatrurim Formation,[2] known for the occurrence of rocks formed due to natural pyrometamorphism.[1] Hashemite is named after the Hashemite Kingdom of Jordan.[2]
References
- ↑ 1.0 1.1 1.2 1.3 "Hashemite: Hashemite mineral information and data". http://www.mindat.org/min-1823.html. Retrieved 5 March 2016.
- ↑ 2.0 2.1 2.2 Hauff, P.L., Foord, E.E., and Rosenblum, S., 1983. Hashemite, Ba(Cr,S)O4, a new mineral from Jordan. American Mineralogist 68, 1223-1225.
![]() | Original source: https://en.wikipedia.org/wiki/Hashemite (mineral).
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