Polished Green Opal rock GRN115 alcheringa narrina Dimensions at widest points approximately

Dimensions at widest points approximately 100 mm x 90 mm

From our mining claim near Noreena Downs Station in the Pilbara region of Western Australia

A trade name for metamorphosed magnesian tholeiite (basalt)

170 mm x 100 mm x 9 mm

Dimensions at widest points approximately 200 mm x 120 mm x 60 mm thick

Polished Green Opal rock GRN115 alcheringa narrina 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.