Possible ancient tool.

[chriseneim]

Found it in up in carefree Arizona in a dry wash. Fits hand perfect and has noches made for thumb and back side is almost perfectly flat. Heavy and non magnetic.

 

[rock]

Natural I do believe but thanks for the view. Maybe broken

 

[Treasure_Hunter]

Looks natural to me as well...... Mother nature makes billions of rocks that man can see something in if he looks hard enough but they are still rocks... I found thousands of rocks while hunting in Missouri, my imagination would run wild trying to find a way for it to fit in my hand, I found hundreds and hyndreds that could fit in y hand if I kept trying but in they end they were still just rocks........