Polished Green Opal slab GRN93. aquamarine 180 mm x 150 mm

180 mm x 150 mm x 8

a small abandoned gold mining centre in the Midwest region of Western Australia

Dimensions at widest points approximately 200 mm high x 100 mm wide x 90 mm thick

Dimensions at widest points are approximately 140 mm x 45 mm x 40 mm

Approximate dimensions at widest points 145 mm  x 65 mm  x 12 mm thick

Polished Green Opal slab GRN93. aquamarine 180 mm x 150 mmGRN93 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..