Polished Green Opal slab GRN98. chalcedony GRN88 Green Opal & Magnesite

GRN88  Green Opal & Magnesite slab

Dimensions at widest points approximately 95 mm x 90 mm x 8 mm thick

Dimensions at widest points approximately 105 mm x 75 mm x 50 mm thick

From near the Kennedy Ranges

Dimensions at widest points approximately 160 mm x 105  mm x 9

Polished Green Opal slab GRN98. chalcedony GRN88 Green Opal & MagnesiteGRN98 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 110 mm x 85 mm x 10 mm thick Weighs 156 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..