Polished Green Opal rock GREEN84 mookarite All reasonably uniform in size

All reasonably uniform in size (roughly 15 - 20 mm diameter}

Dimensions approximately 160 mm x 45 mm x 7 mm thick

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

Weight  is 982 grams

8 billion years

Polished Green Opal rock GREEN84 mookarite All reasonably uniform in sizeGREEN84 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 225 mm x 85 mm x 65 mm thick Weighs 1,315 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.