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Chemically, the distinction between limestone and dolostone is that the first one is chiefly composed of calcite, CaCO3, whereas the second is rich in MgCO3-Dolomite-. Therefore, the difference is limestone has Ca and Dolostone has Mg.
Mg is replacing Ca in the dolostone, in other words.
It is very difficult to make the distinction in a macro-scale samples. You will need optical or chemical procedures to differentiate each one.

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14y ago
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9y ago

Limestone has a high content of calcite. When the HC1 is dropped on it, there is an immediate reaction of fizzing and bubbling. Dolostone is almost completely dolomite. The reaction is much lower, with less fizzing. and bubbling.

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15y ago

Limestone will effervesce profusely when HCL is applied. Dolostone or dolomite will only bubble very slowly.

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Q: How can you distinguish chemical limestone and dolostone?
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