YD102. Fossil stromatolite slab polished on one side.
Yelma digitata from the Proterozoic "Yelma Formation".
Age is approx. 1.7 billion years.
From near Wiluna in Western Australia.
6.5 mm thick. Approx. 125 mm x 120 mm at widest points. 220 grams.
Polished Chrysoprase CH352
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