Polished Green Opal slab GRN98. agate Dimensions at widest points approximately

Dimensions at widest points approximately 120 mm x 65 mm x 8 mm thick

Weighs 870 grams

Weighs 343 grams

Approximate dimensions at widest points 200 mm  x 100 mm  x 60 mm thick

Weight is 93 grams

Polished Green Opal slab GRN98. agate Dimensions at widest points approximatelyGRN98 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 110 mm x 85 mm x 10 mm thick Weighs 156 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..