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eh??

I have absolutely no idea what this is. I found it on the tideline at Holkham beach in Norfolk; the rounded part is relatively soft and almost chalky; the point/horn/weird thing is hard translucent and shiny. I can only guess - wildly - that it's something to do with a mollusc, but I have no idea what. all ideas will be very gratefully received.

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Taken on July 31, 2009