Polished Green Opal display specimen GRN81 polished prehnite A domal stromatolite from the

A domal stromatolite from the Proterozoic "Irregully Formation" in Western Australia

Dimensions at widest points approximately 120 mm x 60 mm x 11 mm thick

Peanut Wood slab

Dimensions at widest points approximately 140 mm x 120 mm and 11 mm thick

Dimensions at widest points approximately 125 mm x 85 mm x 85 mm thick

Polished Green Opal display specimen GRN81 polished prehnite A domal stromatolite from theGRN81 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back and a cut base to stand on. Dimensions at widest points approximately 155 mm x 80 mm x 60 mm thick Weighs 1,216 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