i'm not sure about crystalizing it but someone gave instructions for extraction on
a reddit post ^^;
"Is there any efficient way to seperate the MPH from the fillers in a Pill? My idea whould be to crush the pills cook it in a mixture of Ethanol and Water (Vodka), filter off the remaining stuff that wouldnt dissolve, then cook the mixture till the ethanol is boiled off and the MPH crashes out of solution since its poor water solubility and then you just filter it off and have a reasonable pure amount of MPH."
"Yea that sounds like your standard ethanol wash. Should be perfectly fine for most all uses except IV. For rig work you probably gonna want a sub micron lab filter, and even then it's still not considered recommended unless insomnia is a personal quest.
Also, 190 proof everclear evaporates so fast the cooking process is unnecessary. Just spread the solution across a casserole dish to encourage evaporation."
also, ik this isn't what you asked for, but
this link may be useful for IV users!