Hashemite (Mineral)

Hashemite
	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

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.

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[Mindat-1] 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.

[AM-2] 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.