Polished Green Opal slab GRN105 Opalite Dimensions at widest points approximately

Dimensions at widest points approximately 145 mm x 130 mm x 50 mm thick

190 mm x 165 mm x 60 mm thick

CH424  Chrysoprase nodule

Weighs 532 grams

OJ182  A rough rock

Polished Green Opal slab GRN105 Opalite Dimensions at widest points approximatelyGRN105 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 140 mm x 80 mm x 12. 5 mm thick Weighs 224 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..