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Eb
IMG_20200516_155642.jpg 
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prep01
Hello and welcome to the forum. To me and I have enlarged the photo, I believe that this is a pebble of sandstone covered in a man-made material, eg tar / bitumen. You could try putting a hot needle into the surfave and if it smells of tat / bitumen you'll know for sure, but of course take precautions!
Colin Huller
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Rolo
Looks like a worn siderite concretion, an iron rich mineral . Not a fossil itself but sometimes these form around fossils.
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Weald on Bed
Agree with Rolo - an ironstone nodule that's been rolled around by the waves for a while. Common feature in the Wealden strata, which outcrop on the IoW. They very often exhibit that reticulated 'cracked-mud' like surface.
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Eb
Many thanks for the replies. 👍
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