Anorthite skarn with dispersed chromium-hydrogrossular from Muslim Bagh area, Pakistan

Hänni, Henry A. and Franz, Leander and Wang, Hao. (2018) Anorthite skarn with dispersed chromium-hydrogrossular from Muslim Bagh area, Pakistan. The Australian Gemmologist, 26 (11-12). pp. 286-290.

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Official URL: https://edoc.unibas.ch/81578/

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A white to light green opaque ornamental rock with green spots, collected near Muslim Bagh, Balochistan, Pakistan was submitted for identification. Thin sections for petrographic investigation were produced and the mineral components identified optically and by Raman spectrometry. Idiomorphic bright green Cr-hydrogrossular crystals are irregularly dispersed throughout the white ground mass of basic plagioclase. Further components comprise minor diopside with clinozoisite, zoisite and zeolites on fractures. Besides Sannan Skarn, this new ornamental stone is far away from belong to the jade group as it is composed of numerous minerals that do not belong to the pyroxene group. It can therefore not be sold as "a kind of jade". The rock has a specific gravity of 2.73 and a refractive index of approximately 1.57 (spot reading done on cabochons, using the same method as gemmologists use on moonstone or jadeite). This material is similar to a rock from Zambales, Luzon, Philippines that was identified as anorthosite, the main constituent mineral is anorthite, an end member of the feldspar group, with idiomorphic small uvarovite crystals.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Quartärgeologie (Fleitmann)
UniBasel Contributors:Franz, Leander
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Gemmological Association of Australia
Note:Additional Publication or Translation in: Chinese, Journal of Gems and Gemmology, DOI: 10.15964/j.cnki.027jgg.2018.06.001 -- Publication type according to Uni Basel Research Database: Journal article
Last Modified:20 Oct 2021 09:16
Deposited On:20 Oct 2021 09:16

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