Polished Green Opal rock GRN102 Marra Mamba Tiger Eye Dimensions at widest points approximately

Dimensions at widest points approximately 160 mm x 90 mm x 10

Dimensions at widest points are approximately 65 mm x 45 mm x 35 mm

Dimensions at widest points approximately 140 mm x 75 mm x 70 mm thick

From near Kalgoorlie

120 mm x 70 mm x 35 mm

Polished Green Opal rock GRN102 Marra Mamba Tiger Eye Dimensions at widest points approximatelyGRN102 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 90 mm x 50 mm x 40 mm thick Weighs 340 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.