Polished Green Opal slab GRN87 slab Dimensions approximately 90 mm x

Dimensions approximately 90 mm x 80 mm x 75 mm thick

Weighs 144 grams

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Polished Green Opal slab GRN87 slab Dimensions approximately 90 mm xGRN87 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.