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Meteorites are rarely ever a ball or sphere type shape, but actually quite irregular.
If it's got layers, lamination, or any kind of linear or planar features, then it's definitely not a meteorite.If it's spherical, then it's probably not a meteorite.
Have you got a scale bar or some dimensions for the object please?Chris
When you say under a tree stump - does this mean that it was under the growing tree? If the tree was particularly old could this fact be used to set a minimum age and thus rule out on a time-line basis anything industrial? Just an idea. I note that Portsmouth was a centre for ceramic and brick manufacture - is it possible that it is some form of by-product other than slag.
On closer inspection I'd like to side with Jimbob and change my vote form "slag" to "interior cast of bloody big shell" ...[attachment=12066]Just found this newbielink:http://www.thefossilforum.com/index.php?showtopic=959 [nonactive] who may be able to help.