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A new ornamental gemstone from Pakistan: Sannan-Skarn
Journal
Proceedings of the 5th International Gem and Jewelry Conference (GIT 2016)
Volume
1
Number
1
Pages / Article-Number
55-61
Keywords
ornamental gemstone, Sannan-Skarn, Pakistan
Abstract
A new deposit of complex fine-grained green rocks was found in Western Pakistan. The material is characterised by its more or less green colour, due to chrome. The mineralogical components vary strongly in short distances and the minerals (hydrogrossular, diopside, aegirine, winchite, pectolite, chlorite, natrolite, sodalite etc.) are not well known to gemmologists. A common term to name the material is skarn, as it describes a rock formed by metasomatic replacement of parent rock, commonly a calc-silicate rock, transformed in a metamorphic process. Sannan is a specific modifier that describes the skarn from the new occurrence.
