Polished Green Opal rock GRN89 asperia Dimensions at widest points approximately

Dimensions at widest points approximately 105 mm x 80 mm x 9 mm thick

Dimensions at widest points approximately 290 mm x 165 mm x 10 mm thick

Weight is 190 grams

AZ120  Azurite sun mineral specimen

Polished Green Opal rock GRN89 asperia Dimensions at widest points approximatelyGRN89 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.