Polished Green Opal rock GRN115 dendritic opal Dimensions at widest point approximately

Dimensions at widest point approximately 135 mm x 75 mm x 8

120 mm x 110 mm  x 9

Dimensions at widest points are approximately 100 mm x 80 mm x 45 mm

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

Polished Green Opal rock GRN115 dendritic opal Dimensions at widest point approximatelyGRN115 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.