Polished Green Opal rock GRN115 dendritic opal Dimensions approximately 160 mm x

Dimensions approximately 160 mm x 100 mm x 100 mm thick

Dimensions at widest points approximately 160 mm x 150 mm x 19 mm thick

NJ440   Noreena Jasper slab

Each polished face approximately 95mm x 30mm x 30 mm thick

Unusual large piece with chrysoprase

Polished Green Opal rock GRN115 dendritic opal Dimensions approximately 160 mm xGRN115 Green Opal rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 125 mm x 100 mm x 50 mm thick Weighs 686 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.