Polished Green Opal rock GREEN84 mookarite Dimensions approximately 160 mm x

Dimensions approximately 160 mm x 45 mm x 7 mm thick

Dimensions at widest points approximately 130 mm x  110 mm x 27 mm thick

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

270 mm x 100 mm x 50 mm thick

Dimensions 130 mm x 80 mm x 50 mm thick

Polished Green Opal rock GREEN84 mookarite Dimensions approximately 160 mm xGREEN84 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.