Polished Green Opal display specimen GRN81 annular rings Dimensions at widest points approximately

Dimensions at widest points approximately 185 mm x 120 mm x 7

Weighs 872 grams

Large piece covered in azurite

190 mm x 165 mm x 60 mm thick

Weighs 300grams

Polished Green Opal display specimen GRN81 annular rings Dimensions at widest points approximatelyGRN81 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back and a cut base to stand on. Dimensions at widest points approximately 155 mm x 80 mm x 60 mm thick Weighs 1,216 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