Polished Green Opal slab GRN105 mookalite Dimensions at widest points approximately

Dimensions at widest points approximately 170 mm x 90 mm x 90 mm thick

Weighs 430 grams

Quartz crystal cavity

Dimensions at widest points approximately 130 mm x 75 mm x 10 mm thick

160 mm x 80 mm x 8 mm thick & weighs 222 grams

Polished Green Opal slab GRN105 mookalite 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..