Possible fossil

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I found this on friday when out on the land and due to the colour I thought it was a lump of corroded iron but when I waved the coil over it there was no signal , Despite the mud when wiped it highlighted the raised patterns to reveal some detail which looked interesting enough to bring home .
Upon cleaning it looks like a piece of fossilised fungi .
45 mm at its widest x 35 mm across and 12mm thick .
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It's an iron pyrite nodule. As you've been finding echinoids which are common in chalk this isn't a surprise. You'll find them on many beaches in clusters and all shapes and sizes. Sometimes you'll get marcasite nodules. If you find a complete ball shaped one and break it you'll find a lovely radiating silver pattern but it will soon tarnish and break up.

If you're lucky you'll find pyritised fossils - attached
Screen Shot 2021-02-07 at 13.35.29.jpg
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