Polished fossil stromatolite slab. Asperia ashburtonia. ASP154 Chrome chalcedony Dimensions at widest points approximately

Dimensions at widest points approximately 100 mm x 55 mm x 60 mm thick

Dimensions at widest points approximately 120 mm x 115 mm x 40 mm thick

85 mm x 60 mm x 25 mm thick

Green Opal occurs at a location south of Kalgoorlie in the Eastern Goldfields of Western Australia

160 mm x 90 mm x 9 mm

Polished fossil stromatolite slab. Asperia ashburtonia. ASP154 Chrome chalcedony Dimensions at widest points approximatelyASP154. Fossil stromatolite slab, polished on one side. Asperia ashburtonia from the Proterozoic "Duck Creek Dolomite". Age is approx. 2 billion years. From near Paraburdoo in Western Australia. Dimensions at widest points approx. 210 mm x 190 mm x 8. 5 mm thick. It weighs 737 grams.