Polished Green Opal rock GREEN85 polished slab Dimensions approximately 170mm x 100mm

Dimensions approximately 170mm x 100mm x 7mm thick

Weight is 537 grams

Weighs 305 grams

Dimensions at widest points approximately 75 mm x 55 mm x 45 mm thick

Brecciated Snakeskin Jasper rough rock

Polished Green Opal rock GREEN85 polished slab Dimensions approximately 170mm x 100mmGREEN85 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 170 mm x 70 mm x 50 mm thick Weighs 622 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.