Polished Green Opal slab GRN87 slab OG175 Polished orbicular granite with

OG175   Polished orbicular granite with natural rough back

Weighs 144 grams

The pink and red colouration can be attributed to the presence of finely disseminated iron oxides

MC109 Marillana Conglomerate slab

Dimensions at widest points approximately 135 mm x 120 mm x 40 mm thick

Polished Green Opal slab GRN87 slab OG175 Polished orbicular granite withGRN87 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.