Polished Green Opal rock GRN89 asperia CH41 Chrysoprase slab polished on

CH41  Chrysoprase  slab polished  on one side

Dimensions at widest points approximately 290 mm x 165 mm x 10 mm thick

AZ120  Azurite sun mineral specimen

December 2022

Dimensions at widest points approximately 55 mm  x 50 mm wide x 5 mm thick

Polished Green Opal rock GRN89 asperia CH41 Chrysoprase slab polished onGRN89 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 210 mm x 60 mm x 65 mm thick Weighs 1,406 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.