Polished Green Opal slab GRN87 slab The pink and red colouration

The pink and red colouration can be attributed to the presence of finely disseminated iron oxides

Dimensions at widest points approximately 120 mm x 100 mm x 14 mm thick

cut and polished on one side with a natural crystalline rear

Dundas  near Zeehan

Polished Green Opal slab GRN87 slab The pink and red colourationGRN87 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 110 mm x 80 mm x 10 mm thick Weighs 171 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.