Polished Green Opal slab GRN99. #brecciated Superb museum quality specimen

Superb museum quality specimen

Dimensions at widest points approximately 110 mm x 80 mm x 7 mm thick

Weight 554 grams

Dimensions at widest points approximately 90 mm x 75 mm x 45 mm thick

Polished Green Opal slab GRN99. #brecciated Superb museum quality specimenGRN99 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 90 mm x 70 mm x 11 mm thick Weighs 121 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..