The original poster has emailed me and it looks like someone sold mdma (mdea/mda) as... crystal meth.
I haven't asked but I am going to quote him here : "The capsule I tested was supposed to be crystal meth. The powder was a white, bitter taste powder. After snorting it, I became awake and more alert almost immediately. I got a little of my lost sensation back (which I had previously lost due to bad e) and felt good for the rest
of the night. This was my first time doing crystal so I don't know what it should feel like. Is what I described the type of feeling you get when you do crystal? Is speed and crystal the same thing?
Do you think it is possible that the crystal powder was mixed with a bit of MDXX substance (not much of it anyway)??"
(I will remove this if the original poster asks me of course)
Anyway, I think it is clear. This was not crystal meth but definitely an interesting case ;-). Also, I don't think it was crystal meth with mdxx, the reaction would have been weird, not to darkpurple/black straight away.
aj