Polished Green Opal slab GRN112 lemon chrysoprase Weight 591 grams

Weight 591 grams

Dimensions at widest points approximately 195 mm x 90 mm x 9

BM317  Brecciated  Mookaite rock

160 mm x 75 mm x 70 mm

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

Polished Green Opal slab GRN112 lemon chrysoprase Weight 591 gramsGRN112 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..