I believe that the mp range can be diferent depending on the crystallization solvents, as well as the aspect, it can explain the diference. For instance this is from the Merck Index:
5806. MDMA.
Hydrochloride, C11H15NO2.HCl, crystals from isopropanol/n-hexane, mp 147-148 deg (Bailey). Crystals from
isopropanol/ether, mp 152-153 deg (Braun).
Anyway I think the same that rhodium, a 95 % is reasonable.