Polished Green Opal slab GRN112 lemon chrysoprase Approximate dimensions at widest points

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

Weight 591 grams

Dimensions at widest points approximately 170 mm x 110 mm and 9 mm thick

brown iron oxides and druzy quartz pockets

Weighs 875 grams

Polished Green Opal slab GRN112 lemon chrysoprase Approximate dimensions at widest pointsGRN112 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 110 mm x 90 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..