GRN109 Green Opal slab, cut and polished on one side .
Dimensions at widest points approximately 95 mm x 70 mm x 11 mm thick
Weighs 144 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.
