Try egg shells......
 
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> Van: G Thomas Watters <[log in to unmask]>
> Aan: [log in to unmask]
> Onderwerp: calcium for snails
> Datum: zondag 5 juli 1998 21:13
>
> I have raised terrestrial snails for some years, but have never solved
the
> calcium problem, i.e., what do you give them for a calcium source. I have
> supplied them with limestone (which I assumed was their natural source),
but
> that doesn't seem to work. They inevitably eat each others shells.
Perhaps
> some of our escargot-raising membership can suggest something. Cuttlefish
bone?