Polished Green Opal slab GRN87 slab Dimensions at widest points approximately

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

Dimensions at widest points approximately 135 mm x 120 mm x 40 mm thick

cut and polished on one side with a natural crystalline rear

Dimensions at widest point approximately 120 mm x 70 mm x 9 mm

MC109 Marillana Conglomerate slab

Polished Green Opal slab GRN87 slab Dimensions at widest points approximatelyGRN87 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.