Polished fossil stromatolite slab. Asperia ashburtonia. ASP125 Green Opal From Wyloo Station in the

From Wyloo Station in the Pilbara region of Western Australia

It weigh 295 grams

From near  Marble Bar in the Pilbara region of Western Australia

Dimensions at widest points approximately 150 mm x 30 mm

It weighs 265grams

Polished fossil stromatolite slab. Asperia ashburtonia. ASP125 Green Opal From Wyloo Station in theASP125. Huge museum quality specimen ! Fossil stromatolite slab polished on one side. Unusual colouration caused by natural iron oxide weathering. Asperia ashburtonia from the Proterozoic "Duck Creek Dolomite". Age is approx. 2 billion years. From near Paraburdoo in Western Australia. 13 mm thick. Approx. 280 mm x 200 mm. 1,734 grams.