A decently sized example of this classic Tsumeb combination.  Although I visited Tsumeb for tourist purposes, I didn't actually expect to find a single rock from the mine available nearly 30 years after the mine closed.  This one came from an old collection in one of the larger cities. It has the crisp tree-frog green you would expect of this copper lead arsenate, over a cluster of calcite crystals that give it form. Some edge scuffing present.