Polished Green Opal slab GRN105 Tumbled stones 170 mm x 135 mm

170 mm x 135 mm x 11 mm

Dimensions at widest points approximately 225 mm x 140 mm x 13 mm thick

Crystalline cylindrical mass with spike on both ends

Dimensions at widest points approximately 105 mm x 95 mm

Good example of fault displacement

Polished Green Opal slab GRN105 Tumbled stones 170 mm x 135 mmGRN105 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..