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Re: Is this a rock or a cannon ball?

Hello Nancy,

Regarding the picture you posted asking if this was a rock or a cannonball:

http://rockhounds.com/rocknet/photos/photo4.jpg

If you compute the weight of a 5" diameter sphere made of iron, you'll see that it is too light to be an iron cannonball (unless it is hollow). The 6 pound weight is more consistent with rock.

A simple test for iron would be to see it a magnet is attracted. If a magnet is not attracted, then you most likely have a rock.

It is possible for rocks to be shaped very round by natural processes. I have found scour stones inside the eroded potholes in rock river beds that were amazingly round.

Another possibility is your object may be a native American artifact. Wouldn't hurt to show it to an authority on artifacts from your area.

From Bob Keller - July 14, 2014 at 16:51:24

Message: 70937



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