Polished Green Opal slab GRN90 prehnite Oldest agates on Earth
Description
Oldest agates on Earth
Weight is 380 grams
Dimensions at widest points approximately 95 mm x 95 mm x 75 mm thick
From near Port Hedland in the Pilbara region of Western Australia
Weighs: 287 grams
Polished Green Opal slab GRN90 prehnite Oldest agates on EarthGRN90 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 200 mm x 100 mm x 16 mm thick Weighs 442 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.
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