Polished Pilbara Agate PA281 polished prehnite Dimensions at widest points approximately

Dimensions at widest points approximately 290 mm  x 170 mm x 12

Each polished face approximately 95mm x 30mm x 30 mm thick

100 mm diameter

PU131  Purple Chalcedony slab

Dimensions at widest points approximately 120 mm x 85 mm x 85 mm thick

Polished Pilbara Agate PA281 polished prehnite Dimensions at widest points approximatelyPA281 A matching pair of polished Pilbara Agate halves with natural rough backs. (A single agate cut in half). Dimensions at widest points of each half approx. 70 75 mm x 45 mm x 30 35 mm thick. Weight of both is 322 grams. Studies have shown that these are probably the oldest agates in the world with an age in excess of 2 billion years. They occur in the Maddina Formation in the Pilbara region of Western Australia. From near Nullagine, Pilbara