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Salamis cacta
Salamis cacta, the Lilac Mother-of-Pearl or Lilac Beauty, is a butterfly in the Nymphalidae family. I was lucky to see this, as adults usually fly in the forest canopy, but may descend to suck at damp patches or to settle in the undergrowth.
Seen on the veranda of a cottage in a clearing in an primary forest in Uganda. The habitat consists of forests, including disturbed forest habitats.
Last photo shows the habitat.
I guess it all depends on the angle from which you're looking at it with the iridescence... but common names can be very arbitrary :-)