Polished Green Opal rock GRN95 prehnite Dimensions at widest points approximately

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

Weighs 443 grams

SU169  Sunset Jasper slab

Dimensions at widest points approximately 100 mm x 60 mm x 70 mm thick

rough rock cut and polished on one side with a rough

Polished Green Opal rock GRN95 prehnite Dimensions at widest points approximatelyGRN95 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.