Polished Green Opal slab GRN113 polished noreena Dimensions at widest points approximately

Dimensions at widest points approximately 180 mm x 135 mm x 13 mm thick

Weighs 124 grams

TI369   Tiger Iron rough rock

Brockman in the Pilbara region of Western Australia

DO154 Dendritic Opal rough rock

Polished Green Opal slab GRN113 polished noreena Dimensions at widest points approximatelyGRN113 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 150 mm x 100 mm x 11 mm thick Weighs 318 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..