Polished Green Opal rock GRN115 black conglomerate Dimensions at widest points approximately

Dimensions at widest points approximately 75 mm x 40 mm x 30 mm thick

It weighs 764 grams

Dimensions at widest points approximately 150 mm x 100 mm x 870 mm thick

BM299  Brecciated  Mookaite slab

230 mm x 90 mm x 14 mm

Polished Green Opal rock GRN115 black conglomerate Dimensions at widest points 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.