Polished Green Opal slab GRN86 #google Dimensions at widest points approximately

Dimensions at widest points approximately 110 mm  x 40 mm wide x 30 mm thick

Dimensions at widest points approximately 110 mm x 70 mm x 55 mm thick

Approximate weight of each piece is between 55 and 150 grams

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Polished Green Opal slab GRN86 #google Dimensions at widest points approximatelyGRN86 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 110 mm x 60 mm x 11 mm thick Weighs 107 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.