Polished Green Opal slab GRN90 picture jasper Small cavity lined with drusy

Small cavity lined with drusy crystals

Weight of both is 460 grams

Weighs  752 grams

Dimensions at widest points approximately 155 mm x 85 mm x 8 mm thick

Weighs 362 grams

Polished Green Opal slab GRN90 picture jasper Small cavity lined with drusyGRN90 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.