Another very unusual specimen from the Katanga copper crescent, this one a mix of plancheite with malachite orbs. The more you look at it, the more weird stuff seems to be going on, and the harder it is to figure out. Usually it is possible to piece together what happened first, but in this case it's a bit more difficult, so I'll just list the odd features:
The seemingly formless, underlying plancheite mass in some areas seems to have a vague crystal structure, and in places you can see both grooves and cores of a slightly different color that indicate a pseudomorph after something.
The malachite appears to have crystalized over this plancheite mass; where the malachite crystals are small it looks to be a later generation of mineralization, but then you get to the malachite orbs, which are somehow internally pseudomorphed to plancheite. Did the malachite crystalize over the plancheite, and then later become plancheite too?
On a totally unrelated note, seeing the semi-hollow structure of these malachite/plancheite orbs strongly reminds me of the new, rounded dioptase casts from Ntola in (the other) Congo... everyone is saying that they are possibly pseudomorphs after shattuckite, but it could possibly be after something like this....