@GurnEr JoshE @ pisspotnrock sounds like you have MDAT
6,7-Methylenedioxy-2-aminotetralin (MDAT) is a drug developed in the 1990s by a team at Purdue University led by David E. Nichols. It appears to act as a serotonin releasing agent based on rodent drug discrimination assays comparing it to MDMA, in which it fully substitutes for, and additionally lacks any kind of serotonergic neurotoxicity. Hence, MDAT is a non-neurotoxic, putative entactogen in humans.
and has a very distinctive appearance - yellow translucent crystals between 1/16th and 1/4th of an inch along their largest dimension.