Polished Green Opal rock GRN115 alcheringa narrina From our mining claim near

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

A trade name for metamorphosed magnesian tholeiite (basalt)

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

Dimensions at widest points approximately 130 mm x 80 mm x 11

170 mm x 100 mm x 9 mm

Polished Green Opal rock GRN115 alcheringa narrina From our mining claim nearGRN115 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.