Black Duck - What a Beauty

Does anyone know what kind of duck this is? I tried to look it up and the only think I found was an American Black Duck but they don't look like this. When it swam out of the water on shore the sun was very bright but I could see the colored feathers. They actually looked purple and then sometimes they looked blue. They photographed more blue in these photos but you can see the trace of purple. Depending on how the feathers caught the light they looked purple.


I was fascinated by the color of this duck and really wished it had not been out in full sun. I have GOT to learn how to work my camera when I'm trying to capture dark birds. I'd welcome any tips.