GREEN75 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back
Dimensions at widest points approximately 190 mm x 110 mm x 55 mm thick
Weighs 1,980 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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