what was this used for,the hole doesnt look natural?

[oldmillman]

 

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[StoneWhisper]

Native American fire starter, incense burner, mini spice grinder..

 

[rockheadhunter421]

It may be a natural concretion. Otherwise, if you think a Native American made it, then it may have been a mortar bowl.

 

[MrLee]

If it is Native American it was given to you by your grandfather right.

 

[DDancer]

I'd go with the top holder of a fire starter. Its not a concretion.... if it were there would be some sort of banding and the grain of that rock does not indicate any layering. neat find