An acro of some sort. I have one very similar that has been called a 'blue smurf' for years around ARC. It is not the 'Papa Smurf' that you sometimes see. It can be purple but under the right conditions it will turn a really nice smurf blue. Sorry I can't help more but when I have one I can't identify, I'll make 2 frags of it and place them in different spots. One with more light and one with less in order to see if I can get the colors to change at all and give me a better idea as to what it might be.