Polished Green Opal rock GRN104 Rhodonite Dimensions at widest points approximately

Dimensions at widest points approximately 75 mm x 50 mm x 28 mm thick

Dimensions approximately 120 mm x 30 mm x 10 mm thick

OJ165  A rough rock

95mm x 65mm x 9mm thick

Weight is 112 grams

Polished Green Opal rock GRN104 Rhodonite Dimensions at widest points approximatelyGRN104 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 140 mm x 100 mm x 70 mm thick Weighs 1,334 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.