Polished Green Opal slab GRN86 #google Approximate weight of each piece

Approximate weight of each piece is between 55 and 150 grams

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

100 mm x 50 mm x 30 mm thick

190 mm x 95 mm x 70 mm thick

Polished Green Opal slab GRN86 #google Approximate weight of each pieceGRN86 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.