Polished Green Opal slab GRN88 epidote Dimensions at widest point approximately

Dimensions at widest point approximately 170 mm x 120 mm x 9 mm

Approximate dimensions at widest points 235 mm  x 140 mm  x 13 mm thick

Displays excellent cross section of circular columns

Dimensions at widest points approximately 175 mm x 95 mm x 75 mm thick

125 mm x 95 mm x 30 mm

Polished Green Opal slab GRN88 epidote Dimensions at widest point approximatelyGRN88 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 190 mm x 55 mm x 14 mm thick Weighs 1228 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.