Polished De Grussa copper ore slab CO120 #googleimages The interesting cylindrical cavity is

The interesting cylindrical cavity is all that remain of a fossil belemnite which was a squid-like creature with a tapering torpedo or bullet shaped body

Diameter approx

PA263  Pilbara Agate rough rock

Total weight 185 grams

DO184  Dendritic Opal slab polished on one side

Polished De Grussa copper ore slab CO120 #googleimages The interesting cylindrical cavity isCO120 DeGrussa copper ore slab, polished on one side. Dimensions at widest points approximately 145 mm x 110 mm x 10 mm thick. Weighs: 447 grams A mix of copper minerals that formed in the upper oxidised zone. Consisting of dark green malachite, tenorite, minor cuprite and brown iron oxides. The Degrussa underground mine is a high grade copper deposit in Western Australia that commenced operation in 2012 and ceased mining in 2022.