Polished Green Opal rock GRN101 pilbara agate 5") Each piece approximately 3

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

66 mm x 31 mm x 6 mm thick dome

Weighs  752 grams

140 mm x 90 mm x 40 mm thick

Dimensions approximately 170 mm x 110 mm x 11

Polished Green Opal rock GRN101 pilbara agate 5") Each piece approximately 3GRN101 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.