Polished fossil stromatolite slab. Alcheringa narrina. ALC158 Wanong Dendritic Opal cut and polished on one

cut and polished on one side at right angles to crystal growth

POT134  Tumble polished Pink Opal from Mooka Creek

Dimensions at widest points approximately 170 mm x 90 mm x 11 mm thick

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

Polished fossil stromatolite slab. Alcheringa narrina. ALC158 Wanong Dendritic Opal cut and polished on oneALC158 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.