GRN117 Green Opal slab, cut and polished on one side .
Dimensions at widest points approximately 195 mm x 65 mm x 14 mm thick
Weighs 339 grams.
Green Opal occurs at a location south of Kalgoorlie in the Eastern Goldfields of Western Australia.
The green colouration is caused by traces of nickel and/or chromium. Sometimes it exhibits striking contrasting veins of magnesite..
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