Polished fossil stromatolite slab. Alcheringa narrina. ALC158 Wanong Dendritic Opal Contour polished Chrysoprase from near

Contour polished Chrysoprase from near Newman

Red in this piece

TIR139 Tiger Iron rough rock

Approximate dimensions at widest points 100 mm  x 70 mm  x 40 mm thick

Very unusual zoning as well as a cross-cutting quartz vein

Polished fossil stromatolite slab. Alcheringa narrina. ALC158 Wanong Dendritic Opal Contour polished Chrysoprase from nearALC158 Fossil stromatolite slab, polished on one side. Alcheringa narrina from the Archaean Meentheena Member within the Tumbiana Formation. Age is approx. 2. 7 billion years. From near Nullagine in Western Australia. Dimensions at widest points approx. 160 mm x 90 mm x 17 mm thick. Weighs 493 grams.