Polished Green Opal rock GRN115 polished magneprase Dimensions at widest points approximately

Dimensions at widest points approximately 150 mm x 150 mm x 11 mm thick

It weighs 363 grams

Chert Breccia polished slab

Dimensions at widest points approximately 195 mm x 145 mm x 13 mm thick

Polished Green Opal rock GRN115 polished magneprase Dimensions at widest points approximatelyGRN115 Green Opal rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 125 mm x 100 mm x 50 mm thick Weighs 686 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.