Polished Green Opal slab GRN117 chrysoprase Dimensions at widest points approximately

Dimensions at widest points approximately 120 mm x 110 mm x 13 mm thick

Weighs 212 grams

Dimensions at widest points approximately 55 mm  x 50 mm wide x 5 mm thick

Weight is 246 grams

CLA260   Australian Crazy Lace Agate slab

Polished Green Opal slab GRN117 chrysoprase Dimensions at widest points approximatelyGRN117 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..