I was just watching an interview with Nick Sand where he stated that pure DMT exhibits piezoluminescence. Sure enough, wikipedia states:
Has anyone observed this?
In the folk-literature surrounding psychedelic production, DMT, 5-MeO-DMT, and LSD have been reported to exhibit piezoluminescence. As specifically noted in the book Acid Dreams, it is stated that Augustus Owsley Stansley III, one of the most prolific producers of LSD in the 1960s, observed piezoluminescence in the compound's purest form,[5] which observation is confirmed by Alexander Shulgin: "A totally pure salt, when dry and when shaken in the dark, will emit small flashes of white light."
Has anyone observed this?

:d