Polished Green Opal slab GRN113 stripey Dimensions at widest points approximately

Dimensions at widest points approximately 200 mm x 85 mm x 7 mm thick

Weighs 744 grams

Dimensions at widest points approximately 105 mm x 100 mm x 9 mm thick

MN140  Magneprase rough rock

Dimensions at widest points approximately 110 mm x 65 mm x 50 mm thick

Polished Green Opal slab GRN113 stripey Dimensions at widest points approximatelyGRN113 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 150 mm x 100 mm x 11 mm thick Weighs 318 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..