Polished Green Opal rock GREEN83 rock block cut and polished on one

cut and polished on one side with a cut base to stand as a display specimen

It weighs 857 grams

Dimensions approximately 70mm x 100mm x 10-30mm thick

Approximate dimensions at widest points 145 mm  x 65 mm  x 12 mm thick

Museum quality specimen

Polished Green Opal rock GREEN83 rock block cut and polished on oneGREEN83 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 180 mm x 100 mm x 75 mm thick Weighs 1,834 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.