Polished Green Opal slab GRN98. chalcedony Dimensions at widest points approximately

Dimensions at widest points approximately 95 mm x 90 mm x 8 mm thick

Dimensions at widest points approximately 160 mm x 105  mm x 9

From near the Kennedy Ranges

Dimensions at widest points approximately 150 mm x 150 mm x 9

Dimensions at widest points approximately 105 mm x 75 mm x 50 mm thick

Polished Green Opal slab GRN98. chalcedony Dimensions at widest points approximatelyGRN98 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 110 mm x 85 mm x 10 mm thick Weighs 156 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..