Polished Pilbara Agate PA285 Unakite The matrix that this copper

The matrix that this copper based mineral forms on is kaolinite

70 mm x 60 mm  x 40 mm

A trade name for metamorphosed magnesian tholeiite (basalt)

Dimensions at widest points approximately 210 mm  x 150 mm x 90 mm thick

It weighs 675 grams

Polished Pilbara Agate PA285 Unakite The matrix that this copperPA285 Pilbara Agate , cut and polished on one side with a rough, natural back. Dimensions at widest points are approximately 130 mm x 100 mm x 70 mm. thick. Weighs 1,241 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 region, Western Australia.