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Sunday, March 30, 2008

Facetted Green Tsavorite

Facetted green tsavorite of 0.91 cts

It is a variety of the garnet group species grossular, a calcium-aluminium garnet with the formula Ca3Al2Si3O12

Green grossular had been rare until 1967, when British gem prospector and geologist Campbell R. Bridges came across a deposit of the mineral in the mountains of north-east Tanzania.

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