Polished Green Opal rock GRN101 pilbara agate Dimensions approximately 170 mm x

Dimensions approximately 170 mm x 110 mm x 11

Weighs:  208 grams

66 mm x 31 mm x 6 mm thick dome

125 mm x 95 mm x 30 mm

5") Each piece approximately 3 - 4 cm at widest points

Polished Green Opal rock GRN101 pilbara agate Dimensions approximately 170 mm xGRN101 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 90 mm x 55 mm x 30 mm thick Weighs 205 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.