Polished Green Opal slab GRN87 slab Dimensions at widest point approximately

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

Dimensions approximately 90 mm x 80 mm x 75 mm thick

Weighs 144 grams

Dundas  near Zeehan

MC109 Marillana Conglomerate slab

Polished Green Opal slab GRN87 slab Dimensions at widest point 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.