Do they sell jewelry making supplies and do they have crystals/minerals?

Only if someone has donated them recently.

Jewelry making I'd say yes, crystals not usually. Huge selection of costume jewelry if you're into fixing and mixing. Check out the crystal bead bizarre in Lawrenceville on the corner of Butler and 42

It probably depends on what was recently donated, last week there weren't any crystals/minerals, but there were a few types jewelry making supplies.