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Good afternoon, I have been looking for an ID on these for a while. I have found a thread from another site where they said the following. "Thank you for your enquiry, I have shown your specimen to a number of palaeontologists who found it interesting. After carefully examining your specimen, it seems that the most likely identification is pyrite forming around a phosphate nodule. It is possible that in the first instance, it formed around something biogenic, however, sadly, there is not enough evidence to be able to tell. The Isle of Sheppey is particularly interesting for studying Taphonomy (the study of decaying organisms over time and how they may become fossilzed). It can be considered a special place of preservation called a “Lagerstatten”. http://www.nhm.ac.uk/natureplus/message/85395 I was wondering if the regular internal geometry from the few 'balls' I have found may shed any more light on a possible answer. I love the way they only break in 3 almost equal directions. Even if these are not fossils, I still find it enchanting the way nature can produce these fractal shapes. Thanks in advance for any advice/answers you can give on these.