Polished fossil stromatolite slab. Strelley Pool Formation SPF143 Green Opal Weighs 950 grams

Weighs 950 grams

A trade name for metamorphosed magnesian tholeiite (basalt)

Dimensions at widest points approximately 200 mm x 170 mm x 50 mm thick

Studies have shown that these are probably the oldest agates in the world with an age in excess of 2 billion years

Polished fossil stromatolite slab. Strelley Pool Formation SPF143 Green Opal Weighs 950 gramsSPF143. Fossil stromatolite slab, polished on one side. These are the oldest known fossils on Earth. From the Strelley Pool Formation in the Pilbara region of Western Australia. Age is approx. 3. 4 billion years. Dimensions approx. 250 mm x 155 mm x 10 mm thick. Weighs 799 grams.