Polished Green Opal display specimen GRN94 rare These interesting mineral oddities occur

These interesting mineral oddities occur in the banks of the Gascoyne River about 130 km east of Carnarvon

Dimensions approximately 140 mm x 50 mm x 37 mm thick

It weighs 934 grams

TI206   Tiger Iron rough rock

Dimensions at widest points approximately 175 mm x 130 mm x  9 mm thick

Polished Green Opal display specimen GRN94 rare These interesting mineral oddities occurGRN94 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 180 mm x 90 mm x 65 mm thick Weighs 1,363 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