Back yard dredge what is it

Was dredging a small creek across the river at the neighbors and this was in my pan. There isn't supposed to be any gold in these creeks but I was doing some testing just to make sure, came up with this. It has 10 total sides.
Any Ideas?

Jog the only things I could come up with that are kind of similar don't really narrow it down much. And as you can see from the lists, there's a lot of possibilities of what minerals it could be, if its even either one of those shapes.

http://webmineral.com/crystal/Tetragonal-Dipyramidal.shtml

http://webmineral.com/crystal/Tetragonal-DitetragonalDipyramidal.shtml

I suggest you should consult mindat's geologists identify help board at http://www.mindat.org/msgboard-11.html

i'm not familiar with your area,   but i find a lot of naturally faceted garnets here in ga. some are irregular but some are almost perfect. they can be very dark ,almost black like schorl or tourmaline to red .

Thanks for the info guys!
I had a chance to get it to a Jeweler today who buys and deals with gem stones from all over the world. After taking a long look through several different lights, he believes it's a Garnet. But he did say that he had never seen one that shape and it was very unusual.
Thanks for looking...

i have some fairy crosses that looks just  like the small gem it amazing how nature can make  stright line out of gem