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Oyster Shells, Snail Shells

>> I add Calcium for my plants in the form of Oyster Shell which does
>> contain any carbonates. Therefor I am increasing GH and not KH.
> This is a new one on me - what are Oyster shells made of?

>From Encyclopaedia Britannica:
        MOLLUSCA.  An important group of invertebrate animals...
comprising such forms as... aquatic snails... (and) oysters...
        The shell... consists in most cases of an organic matrix of
conchyolin (an albuminoidal substance), impregnated with mineral
salts.  The latter consist mainly of calcium carbonate, but small
quantities of calcium phosphate and magnesium carbonate are also