Azurite

Azurite from Burra Burra Mine, Burra, South Australia, Australia, measuring 63 × 42 × 22 mm and weighing 63 grams. This piece has a particularly welcome historical detail: the recorded provenance states that George McDonald collected it in 1979. That year gives a specific collecting context to the specimen, quite separate from the much older geology that produced the mineral.

Azurite is a copper carbonate hydroxide and belongs to the secondary mineral assemblages associated with altered copper deposits. It is chemically related to Malachite, although the two are distinct species. Their relationship makes Azurite an engaging subject for a collector interested in the different products that copper can form as mineral-bearing fluids respond to changing conditions.

The rich blue surface is broken into rounded nodules, with pale cream areas interrupting the colour. Those small rises and hollows give the piece a tactile-looking relief that is quite different from a flat mineral coating. A front-facing display brings out the blue, while an angled view makes the nodular structure easier to follow. The accompanying specimen record identifies it as a complete hollow nodule, an especially interesting feature alongside its rounded exterior. The named collector and 1979 date are the strongest personal thread in this specimen's history. They connect the piece to a particular collecting event rather than simply a former owner. For anyone who values Australian mineral provenance, that is a detail worth preserving carefully, giving this Azurite a place in both the mineralogical and human history of Burra collecting.