Polished Green Opal slab GRN90 prehnite DO186 Wanong Dendritic Opal rough

DO186  Wanong Dendritic Opal rough rock

Weight is 380 grams

Dimensions at widest point approximately 130 mm x 110 mm x 8 mm

Weighs 483 grams

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

Polished Green Opal slab GRN90 prehnite DO186 Wanong Dendritic Opal roughGRN90 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 200 mm x 100 mm x 16 mm thick Weighs 442 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.