Vivianite:
Hydrated iron phosphate.
Env: In oxidation zone of sulfide deposits and as an alteration product
of some ferromanganese-bearing phosphates in pegmatites. Also found in
sedimentary rocks associated with fossil remains of bones, shells etc.
Ref: The Macdonald Encyclopedia of Rocks and Minerals, 1990.
In message <[log in to unmask]>, Cluny Johnstone
<[log in to unmask]> writes
>Dear Jen,
>
>It looks to me like a mineral concretion called Vivianite. I have seen it
>quite often on bones from waterlogged conditions. Not sure about the
>chemistry of vivianite but I'm sure someone else will!
>
>Hope thats a help
>
>Cluny Johnstone
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Jan Light
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