As has been echoed, test it.
It could very easily be methylone - in fact, I've seen some methylone that looked exactly like that but tinted pink.
The fact is that so many substances can crystalize like MDMA that you have no idea without testing it.
Even with testing its still taking a chance unless you run the full gamut of tests (marquis, mecke, mandelin, simons, robadope) as a positive for MDMA doesn't mean it doesn't have something else in there.