GRN105 Green Opal & Magnesite slab, cut and polished on one side .
Dimensions at widest points approximately 140 mm x 80 mm x 12.5 mm thick
Weighs 224 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..
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