From what I can remember it was a pure fantasy tale. There was hero, who might have been a halfling of some sort, who was on a quest. He had a magic crystal or amulet that he was learning how to focus and store spells in little honeycomb-like chambers inside the crystal. He MIGHT have been an apprentice at some point to learn how to use the crystal. The author may or may not have spelled it "magick" with a k in the book. Since it was in the middle school library, it might have been a YA book, but it is also possible that they just assumed any fantasy was for kids so I am not totally sure about that either. That's about all I can remember. It might have been part of a series.
Any help would be great, thanks!