Polished Green Opal slab GRN100. Brecciated Mookaite 120 mm x 90 mm

120 mm x 90 mm x 50 mm thick at widest points

Dimensions at widest points are approximately 85 mm x 70 mm x 50 mm

Dimensions approximately 70mm x 100mm x 10-30mm thick

Dendritic Opal

This museum quality specimen has been cut at right angles to the bedding and displays the columnar structure beautifully

Polished Green Opal slab GRN100. Brecciated Mookaite 120 mm x 90 mmGRN100 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 160 mm x 75 mm x 11 mm thick Weighs 283 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..