Polished Green Opal rock GRN96 rare agate banded chert

banded chert

Dimensions at widest points approximately 80 mm x 65 mm x 12 mm thick

Dimensions approximately 200 mm x 120 mm x 100 mm thick

Weighs 594 grams

This specimen is from east of the Darling Ranges just outside the city of Perth

Polished Green Opal rock GRN96 rare agate banded chertGRN96 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 120 mm x 55 mm x 35 mm thick Weighs 322 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.