I have no experience with this. But I found little bags of what looks like little broken shards of glass in my kids dresser. I asked a coworker what it was and he said crank. But after reading some things on the internet I believe it might be the more pure form of crystal method called glass. Do you have pictures of glass, crystal meth , and the dirty stuff called crank that I can see to compare? This way I know exactly what this is so I can research it?