Polished Green Opal rock GREEN84 stripey Dimensions approximately 130 mm x

Dimensions approximately 130 mm x 120 mm x 90 mm thick

An as yet unidentified stromatolite

190 mm x 160 mm x 9 mm thick

180 mm x 130 mm x 50 mm thick

Polished Green Opal rock GREEN84 stripey Dimensions approximately 130 mm 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.