Polished Green Opal slab GRN108 lepidolite Dimensions at widest points approximately

Dimensions at widest points approximately 185 mm x 120 mm x 7

Dimensions at widest points approximately 130 mm x 110 mm x 8 mm thick

Dimensions at widest points approximately 150 mm x 75 mm x 17 mm thick

PC122 Chalcedony slab

105 mm x 85 mm  x 8

Polished Green Opal slab GRN108 lepidolite Dimensions at widest points approximatelyGRN108 Green Opal slab, cut and polished on one side . Dimensions at widest points approximately 125 mm x 80 mm x 14 mm thick Weighs 232 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.