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Re: Aquatic Plants Digest V2 #553

In a message dated 97-03-02 07:22:40 EST, you write:

<< What can people tell me about
 Aragonite?  >>
It's a source of calcium carbonate that is "mined" in shallow tropical
waters.  Typical composition is 94-97 % CaCO3, about .5 - 1.5 % MgCO3, and a
few hundreths of a percent of iron, aluminum, silicon, and strontium oxides.
 Real popular as a substrate in coral systems.  Dolomite is a fossil material
that is somewhat similar, but with a very large (45%) proportion of MgCO3.
 I'm also curious about what situations call for this type of material in
planted aquariums.

Pete Mohan