That's interesting, could be garnets, hexagonal shape has me thinking beryl or corundum, how hard is it, try scratching it on an unglazed porcelain tile or the back of your toilet top will work to and see if it leaves a streak color, if not it's harder than the streak plate and probably is one of those I mentioned, someone else more experienced might know just by looking at it but what ever it is that's an awesome find, really cool looking specimen.