Polished Green Opal slab GRN87 polished magneprase Dimensions approximately 140 mm x

Dimensions approximately 140 mm x 130 mm x 100 mm thick

Weight is 93 grams

180 mm x 105 mm x 40 mm thick

Dimensions at widest points approximately 115 mm x 75 mm x 40 mm thick

Polished Green Opal slab GRN87 polished magneprase Dimensions approximately 140 mm xGRN87 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.