Polished Green Opal slab GRN88 rare Dimensions approximately 175 mm x

Dimensions approximately 175 mm x 160 mm x 5 mm thick

100 mm x 75 mm x 13 mm thick & weighs 233 grams

IRR 132    Fossil stromatolite slab

Weighs 722 grams

Weighs 362 grams

Polished Green Opal slab GRN88 rare Dimensions approximately 175 mm xGRN88 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 190 mm x 55 mm x 14 mm thick Weighs 1228 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.