Incredible Thunder Stones

Have you ever heard of Thunder Stones? And no, I am not talking about the Pokemon ones, I’m talking about real thunder stones.Here in Honduras I have literally seen hundreds of them and I even have one, of which I am showing you two pictures. I have heard two theories about them. 

One of them states that they are formed at the place were a lightning bolt hits the ground.

The other one is that they are really indian axe heads. I have seen them from 1-1/2 inches long to about 5 inches, the one I have is exactly three inches long. I even was shown one by a lady in Utila in the Bay Islands which had dark red stains on it, the lady told me they were sacrificial axes used to kill people, I have no idea if the stains were really blood.

Because of the different sizes of the stones I have seen I don’t believe they are axes, but I find it harder to believe they are formed by lightning striking the ground.I have looked them up on Google, but most articles there say they are axe heads made of flint at least in the American continent, but the ones I have seen including the one I have are just some kind of stone I don’t believe is flint, they are very smooth, perhaps someone seeing the picture can give me a clue.

Ok, the pictures aren't that good, but I have a lousy cell phone and it's night so you'll have to excuse me, I do think they are good enough to get an idea.