Polished Green Opal slab GRN99. #gemstone Dimensions at widest points approximately

Dimensions at widest points approximately 240 mm x 100 mm x 8 mm thick

Dimensions at widest points approximately 95 mm x 80 mm x 6

Weighs 204 grams

50 mm x 40 mm  x 20 mm

PG122  Pegmatite slab

Polished Green Opal slab GRN99. #gemstone Dimensions at widest points approximatelyGRN99 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 90 mm x 70 mm x 11 mm thick Weighs 121 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..