Polished Green Opal rock GRN95 brecciated Dimensions approximately 145 mm x

Dimensions approximately 145 mm x 100 mm x 55 mm thick

Dimensions at widest points approximately 70 mm x 50 mm x 18 mm thick

Weighs 236 grams

140 mm x 70 mm  x 8 mm

It weighs 182 grams

Polished Green Opal rock GRN95 brecciated Dimensions approximately 145 mm xGRN95 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 190 mm x 100 mm x 90 mm thick Weighs 1,092 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.