Polished Green Opal rock GRN89 toredo From near Tamworth

From near Tamworth

Weight  is 668 grams

60 mm x 45 mm  x 16 mm

Dimensions at widest points approximately 95 mm x 70 mm x 60 mm thick

190 mm x 90 mm x 10 mm thick

Polished Green Opal rock GRN89 toredo From near TamworthGRN89 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 210 mm x 60 mm x 65 mm thick Weighs 1,406 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. Sometimes it exhibits striking contrasting veins of magnesite.