Polished Green Opal rock GREEN84 mookatite Face is approximately 110mm x

Face is approximately 110mm x 55mm and  20mm thick

80 mm x 70 mm x 30 mm thick

Weighs 171 grams

PA226  An Agate nodule

Tumble polished Variscite

Polished Green Opal rock GREEN84 mookatite Face is approximately 110mm xGREEN84 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 225 mm x 85 mm x 65 mm thick Weighs 1,315 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.