Polished Green Opal slab GRN105 Tumbled stones Dimensions at widest points approximately

Dimensions at widest points approximately 105 mm x 95 mm

Weight 338 grams

170 mm x 135 mm x 11 mm

Dimensions at widest points approximately 180 mm x 105 mm and 8

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

Polished Green Opal slab GRN105 Tumbled stones Dimensions at widest points approximatelyGRN105 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..