Polished Green Opal slab GRN86 oldest agate in the world IRR114 Fossil stromatolite slab polished

IRR114  Fossil stromatolite slab polished on one side

Dimensions approximately 160 mm x 130 mm x 90 mm thick

Comes as one flat with lid and boxes included

Dimensions at widest points approximately 80 mm x 60 mm x 32 mm thick

Polished Green Opal slab GRN86 oldest agate in the world IRR114 Fossil stromatolite slab polishedGRN86 Green Opal & Magnesite slab, cut and polished on one side . Dimensions at widest points approximately 110 mm x 60 mm x 11 mm thick Weighs 107 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.