oyster shells
you can get oyster shells from a animal feed store. they feed chickens with it or something weird like that.
if you use oyster shells, the rocks come out really light and porous.
if you really want to use aragonite, i would use it as the mould so the outside of the rock is covered with aragonite while the inside is oyster shells. or you can also use oyster shells for the mould as well.
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If people don't die, it wouldn't make living important.
And why do we fall? So we can learn to pick ourselves up.
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