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| [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. ↑ 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. ↑ 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.

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/Hashemite (mineral). Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Chemistry:Hashemite_(mineral)&oldid=440238"