Polished Green Opal slab GRN86 oldest agate in the world Comes as one flat with

Comes as one flat with lid and boxes included

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

Dimensions at widest points approximately 145 mm x  105 mm x 55 mm thick

IRR 129    Fossil stromatolite slab

Dimensions at widest points approximately 160 mm x 90 mm x 70 mm thick

Polished Green Opal slab GRN86 oldest agate in the world Comes as one flat withGRN86 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.