Acids

Dolomite (Ca,Mg)(CO3)2 is another commonly encountered carbonate mineral. If you place one drop of cold hydrochloric acid on a piece of dolomite the reaction is weak or not observed. Instead of seeing an obvious fizz, you will see a drop of acid on the surface of the mineral that might have a few bubbles of carbon dioxide gas slowly growing on the dolomite surface.
 
However, if warm acid is placed on dolomite an obvious fizz will occur. This occurs because the acid and rock react more vigorously at higher temperatures.
 

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