Polished Green Opal slab GRN100. Brecciated Mookaite Dimensions at widest points are

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

It weighs 356 grams

From Field's Find in the Midwest region

Dimensions 130 mm x 80 mm x 50 mm thick

Dimensions at widest points approximately 150 mm x 110 mm x 11

Polished Green Opal slab GRN100. Brecciated Mookaite Dimensions at widest points areGRN100 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..