Polished Green Opal rock GRN104 polished Noreena Jasper 170 mm x 120 mm

170 mm x 120 mm x 60 mm thick & weighs 2

It weighs 449 grams

Dimensions at widest points approximately 120 mm  x 60 mm wide x 7 mm thick

Unusual colouration caused by natural iron oxide weathering

Dimensions at widest points approximately 110 mm x 85 mm x 9 mm thick

Polished Green Opal rock GRN104 polished Noreena Jasper 170 mm x 120 mmGRN104 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 140 mm x 100 mm x 70 mm thick Weighs 1,334 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.