Polished Green Opal slab GRN100. chrysoprase Dimensions at widest points approximately

Dimensions at widest points approximately 110 mm x 55 mm x 40 mm thick

Dimensions at widest points approximately 90 mm x 50 mm x 30 mm thick

It weighs 85 grams

OG172   Polished orbicular granite with natural rough back

Dimensions at widest points approximately 170 mm x 120 mm x 12 mm thick

Polished Green Opal slab GRN100. chrysoprase Dimensions at widest points approximatelyGRN100 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 160 mm x 75 mm x 11 mm thick Weighs 283 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..