Polished De Grussa copper ore display specimen CO145 polished prehnite Dimensions at widest points approx

Dimensions at widest points approx

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

Weighs 192 grams

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

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

Polished De Grussa copper ore display specimen CO145 polished prehnite Dimensions at widest points approxCO145 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.