Polished fossil stromatolite. Alcheringa narrina. ALC160 Rough rock Dark green is the chalcedony

Dark green is the chalcedony

Dimensions at widest points approximately 155 mm x 95 mm x 50 mm thick

Dimensions at widest points approximately 210 mm x 55 mm x 10 mm thick

Dimensions at widest points approximately 110 mm x 75 mm x 65 mm

Dimensions at widest points approximately 120 mm x 60 mm x 8

Polished fossil stromatolite. Alcheringa narrina. ALC160 Rough rock Dark green is the chalcedonyALC160 Fossil stromatolite , polished on one side with natural weathered exterior on rear. 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. 110 mm x 70 mm x 30 mm thick. Weighs 404 grams.