Polished fossil stromatolite slab. Asperia ashburtonia. ASP152 Wanong Dendritic Opal Dimensions at widest points approximately

Dimensions at widest points approximately 150 mm  x 100 mm x 6

Dimensions at widest points approximately 70 mm x 40 mm x 13 mm thick

Mookaite rough rock

Dimensions at widest points approximately 45 mm x 35 mm x 23 mm thick

OJ180  A slab

Polished fossil stromatolite slab. Asperia ashburtonia. ASP152 Wanong Dendritic Opal Dimensions at widest points approximatelyASP152. 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. 160 mm x 140 mm x 7 mm thick. It weighs 301 grams.