Polished Green Opal slab GRN105 Tumbled stones Crystalline cylindrical mass with spike

Crystalline cylindrical mass with spike on both ends

Good example of fault displacement

Dimensions at widest points approximately 140 mm  x 75 mm x 8

Weight 338 grams

Dimensions at widest points approximately 105 mm high x 70 mm x 25 mm thick

Polished Green Opal slab GRN105 Tumbled stones Crystalline cylindrical mass with spikeGRN105 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 140 mm x 80 mm x 12. 5 mm thick Weighs 224 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..