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GRN89 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back
Dimensions at widest points approximately 210 mm x 60 mm x 65 mm thick
Weighs 1,406 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.