Polished Green Opal slab GRN93. red jasper Dimensions approximately 185 mm x

Dimensions approximately 185 mm x 95 mm x 6 mm thick

Weighs 162 grams

PC121 Chalcedony slab

GRN87  Green Opal & Magnesite slab

Dimensions at widest points approximately 110 mm x 90 mm x 50 mm thick

Polished Green Opal slab GRN93. red jasper Dimensions approximately 185 mm xGRN93 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 115 mm x 90 mm x 9 mm thick Weighs 155 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..