calcite

A shard of iron-stained siliceous matrix encrusted with sharp, colourless rhombs of calcite, the largest of which measures 100 mm on the diagonal. A few of the calcite crystals have a subtle orange blush due to inclusions of iron oxides and there is a trace of conichalcite-duftite (visually identified) on the matrix.

The specimen is from the Clement Victor Latz Collection which was donated to the Australian Bureau of Mineral Resources (now Geoscience Australia) in 1976.

conichalcite-duftite