Polished Green Opal rock GRN95 prehnite RFJ130 Rhyolite (Rainforest Jasper) rough

RFJ130  Rhyolite (Rainforest Jasper) rough rock

PG122  Pegmatite slab

Dimensions at widest points approximately 110 mm x 75 mm x 75 mm thick

rough rock cut and polished on one side with a rough

Dimensions at widest points approximately 115 mm high x 65 mm x 45 mm thick

Polished Green Opal rock GRN95 prehnite RFJ130 Rhyolite (Rainforest Jasper) roughGRN95 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 190 mm x 100 mm x 90 mm thick Weighs 1,092 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.