Polished De Grussa copper ore display specimen CO145 polished prehnite Studies have shown that these

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

polished on one side with a rough natural exterior

Dimensions at widest points approximately 150 mm x 75 mm x 65 mm thick

Dimensions at widest points approximately 140 mm  x 100 mm x 8 mm thick

Weight is 203 grams

Polished De Grussa copper ore display specimen CO145 polished prehnite Studies have shown that theseCO145 DeGrussa copper ore , cut and polished on one side with a cut back and base to sit as a display specimen. Dimensions at widest points approximately 250 mm high x 260 mm wide x 60 75 mm slightly tapering thickness. Weighs: 10. 69 kgs. A mix of copper minerals that formed in the upper oxidised zone. The Degrussa underground mine is a high grade copper deposit in Western Australia that commenced operation in 2012 and ceased mining in 2022.