Polished Green Opal slab GRN87 polished noreena The clinozoisite has replaced but

The clinozoisite has replaced but retained the shape of plagioclase feldspar crystals

DO183  Dendritic Opal rough rock

Dimensions at widest points approximately 150 mm x 115 mm x 60 mm thick

Dimensions approximately 180 mm x 70 mm x 7 mm thick

Polished Green Opal slab GRN87 polished noreena The clinozoisite has replaced butGRN87 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 110 mm x 80 mm x 10 mm thick Weighs 171 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.