Crystal MDMA is a powder or crystallized form of MDMA and is usually called Molly by users and dealers. The street name Molly comes from the word molecule because crystal MDMA is supposedly pure MDMA. With molecular similarities to both the stimulant methamphetamine and the hallucinogen mescaline, MDMA (3-4 methylenedioxymethamphetamine) is a synthetic, psychoactive substance….