Polished Green Opal slab GRN117 Irregully formation 170 mm x 70 mm

170 mm x 70 mm x 60 mm thick & weighs 763 grams

KO107  Killaloe Opal slab

Dimensions at widest points approximately 70 mm x 35 mm x 30 mm thick

NJ443   Noreena Jasper slab

Dimensions approximately 100 mm x 50 mm x 7

Polished Green Opal slab GRN117 Irregully formation 170 mm x 70 mmGRN117 Green Opal slab, cut and polished on one side . Dimensions at widest points approximately 195 mm x 65 mm x 14 mm thick Weighs 339 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..