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Kev,
Things I can tell you about the rock from your pictures....
1. It's sandstone.
2. The angular grains visible would indicate that it formed close to the source of the grains, ie they haven't had time to weather into nice little rounded grains.
3. The reddish colour is probably indicative of a high iron content.
4. It's about twice the size of a 50 cent piece.
I suspect the shape of the rock is due to weathering but without actually seeing the rock live or knowing where you found it I can't be sure. I should point out that it's about 30 years since I looked at a rock per say. Although I did Geology at uni I'm now a Geophysicist so I spend my days looking at a computer screen instead.
Less flies, dust, etc.!!!
Cheers,
Mario
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