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Each piece approximately 3 - 5 cm at widest points
Weighs 532 grams
Weighs 770 grams
POP174 Pink Opal rough rock
A rough rock
Polished Green Opal slab GRN90 microbialite Each piece approximately 3 -GRN90 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 200 mm x 100 mm x 16 mm thick Weighs 442 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.