This thread is like, the definition of speculation and is way to broad/vague/lacking HR value to remain open.
What types of opiates are sold as powder? I can get just about every single commercial formulation of narcotics into powder form (Except those damned OxyContins! but fuck 'em).
This is basically like asking, what kind of DRUGS are sold as powder? Anything, and everything. Unknown research chemicals, the classical street drugs like cocaine and heroin, crushed tylenol pills, the powder removed from benedryl capsules, coffee grounds..... the point I'm making is that your question is one of the vaguest one's I've ever read, and thus it's impossible to answer without speculation. If you want to know what your powdered drugs are, have a sample sent to a lab for gas chromatography / multiple spectrum analysis. That's the only way of knowing what's in your powder.
@OP, disregard everyone who posted speculative answers, none of us know what you have. Please do not make any more posts or threads until you've read the BLUA and OD Guidelines, as you agreed to upon creation of your account.
/thread
edit: whooops, didnt refresh page. good work bro