Polished Green Opal slab GRN87 polished magneprase Dimensions at widest points approximately

Dimensions at widest points approximately 150 mm x 95 mm x 75 mm thick

Weighs 483 grams

Dimensions approximately 140 mm x 130 mm x 100 mm thick

Weight 271 grams

rough rock cut and polished on one side with a rough

Polished Green Opal slab GRN87 polished magneprase Dimensions at widest points approximatelyGRN87 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 110 mm x 80 mm x 10 mm thick Weighs 171 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.