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Prehnite slab
Weight is 1
with both halves polished on one side
also known as Ashburton Agate
CLA232 A slab
Polished fossil stromatolite. Alcheringa narrina. ALC139 agate Prehnite slabALC139. Fossil stromatolite rough rock, cut and 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. Approx. 120mm x 95mm x 50mm thick. This piece has a smattering of pyrite inclusions through it. Rare. Weighs 790grams.
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