Polished Green Opal slab GRN87 polished noreena Dimensions approximately 180 mm x

Dimensions approximately 180 mm x 70 mm x 7 mm thick

SD154 Stromatolitic Dolomite rough rock

Dimensions at widest points approximately 150 mm x 115 mm x 60 mm thick

145 mm x 60 mm x 8

Translucent

Polished Green Opal slab GRN87 polished noreena Dimensions approximately 180 mm xGRN87 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 110 mm x 80 mm x 10 mm thick Weighs 171 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.