When you do an a/b, you'll get dextro amphetamine freebase (before a/b, its Acidic, afterwards its Basic - hence A/B). You then have to titrate or gas to get the hydrochloride again.
But I'm afraid that you won't get any shards from dexedrine: amphetamine hydrochloride is hygroscopic as hell, and it is almost impossible to keep it dry, not to speak of growing large crystals from it.
Methamphetamine HCl crystallizes no prob, but amph HCl does not. At least not without professional technique like vacuum crystallization...
indole_amine