how would you differentiate btw fragments of clear polystyrene glass and quartz?
Normally all stone and gems shops should have it, there must be one near you where you could find some quarts. Most stone and gem shops i know of are in malls.look in your nearest mall.
If you have a lot of high quality quartz you might be able to sell it to a jeweler. Another idea--in addition to okorder--is to put an ad out in the paper.