Purple Chalcedony polished slab. PU147 Polished dendritic opal Sections consist of a chaotic

Sections consist of a chaotic mixture of dolomite and/or stromatolite fragments set in a matrix of mudstone and/or coarsely crystalline dolomite

Dimensions approximately 140 mm x 120 mm x 8 mm thick

Coarse and fine gold is seemingly related to higher concentrations of pyrite within a 200 metre sequence of poorly-stratified

160 mm x 110 mm x 90 mm

Purple Chalcedony polished slab. PU147 Polished dendritic opal Sections consist of a chaoticPU147 Purple Chalcedony slab, polished on one side. Dimensions at widest points approx. 145 mm x 120 mm x 10 mm thick. Weighs 404 grams. From the Eastern Goldfields region of Western Australia.