Polished Green Opal display specimen GRN81 annular rings 190 mm x 165 mm

190 mm x 165 mm x 60 mm thick

Weighs 583 grams

Cut and polished on one side with natural rough exterior on rear

Large piece covered in azurite

Polished Green Opal display specimen GRN81 annular rings 190 mm x 165 mmGRN81 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back and a cut base to stand on. Dimensions at widest points approximately 155 mm x 80 mm x 60 mm thick Weighs 1,216 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