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Hadr
Found on the hill near Redhill/Reigate:

[i3BtZEO]  [Qukdvik]
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MicroFossilMan
Maybe, but very difficult to say without having the pebble in-hand. What colour is it? Hard? Soft?
MFM
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prep01
Can you let us know if you can scratch the main part of the nodule with something steel? If it doesn't scratch then it is flint (which it looks like). The ribbing inside may be part of a fossil bivalve or a form of flint called 'banded flint'.
Colin Huller
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Hadr
It is more or less white and grey with yellow-orange shades as visible on the picture. It is hard. It doesn't seem scratch with steel.
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prep01
Hi Hadr, this is then a flint. The part you are interested in is either part of a bivalve shell (? Inoceramus) or a flint known as 'banded flint' which is formed during the fossilisation og the flint.
Colin Huller
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Hadr
Both possibilities are great 😉
Do you know by any chance if there is a test that would distinguish between a fossil shell or a banded flint?
The material of the ridges/bands is indistinguishable from the whole rock.
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prep01
All you can do is the scratch test.
Colin Huller
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