Polished Green Opal rock GRN102 mookaite Dimensions at widest points approximately

Dimensions at widest points approximately 70 mm x 45 mm x 30 mm thick

Variscite rough rock

Dimensions at widest point approximately 80 mm x 70 mm x 8

Dimensions approximately 120 mm x 30 mm x 10 mm thick

RH257  A slab

Polished Green Opal rock GRN102 mookaite Dimensions at widest points approximatelyGRN102 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 90 mm x 50 mm x 40 mm thick Weighs 340 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.