GRN98 Green Opal & Magnesite slab, cut and polished on one side .
Dimensions at widest points approximately 110 mm x 85 mm x 10 mm thick
Weighs 156 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..
