Polished Green Opal slab GRN93. red jasper Dimensions approximately 185 mm x

Dimensions approximately 185 mm x 95 mm x 6 mm thick

Very unusual piece with much of the variscite altering from green to yellow

Dimensions at widest points approximately 110 mm x 90 mm x 50 mm thick

SD156 Stromatolitic Dolomite slab

Polished Green Opal slab GRN93. red jasper Dimensions approximately 185 mm xGRN93 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 115 mm x 90 mm x 9 mm thick Weighs 155 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..