Polished Green Opal rock GRN115 polished magneprase PC121 Chalcedony slab

PC121 Chalcedony slab

Each piece approximately 5 - 7 cm at widest points

Dimensions at widest points approximately 150 mm x 150 mm x 11 mm thick

Dimensions at widest points approximately 290 mm  x 170 mm x 9 mm thick

Polished Green Opal rock GRN115 polished magneprase PC121 Chalcedony slabGRN115 Green Opal rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 125 mm x 100 mm x 50 mm thick Weighs 686 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.