Mineral: Aragonite
Chemistry: CaCO3
Size: 70 mm
Owner: Mariusz Oleszczuk
Photographer: Mariusz Oleszczuk

A botryoidal aggregate of sea-green aragonite. The colour of the aragonite is almost certainly due to the presence of included copper salts, while a fragment of timber (embedded in the reverse side of the specimen) testifies to its post-mining origin.

Tsumeb was an extremely wet mine hosted by carbonate (dolostone) country rock, and masses of aragonite "flowstone" formed rapidly in many parts of the workings. Most, if not all, of the poorly crystallised but colourful (blue and green) specimens of aragonite from Tsumeb are of post-mining origin.