Polished Green Opal slab GRN105 Opalite 190 mm x 165 mm

190 mm x 165 mm x 60 mm thick

Dimensions at widest points approximately 90 mm x 80 mm x 70 mm deep

135 mm x 85 mm x 50 mm thick

CH424  Chrysoprase nodule

Dimensions at widest points approximately 150 mm x 140 mm x 9

Polished Green Opal slab GRN105 Opalite 190 mm x 165 mmGRN105 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 140 mm x 80 mm x 12. 5 mm thick Weighs 224 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..