Every serious field geologist carries a small bottle of acid to perform this quick field test, used to distinguish the most common carbonate rocks, dolomite and limestone. A few drops of the acid are put on the rock, and limestone responds by fizzing vigorously. Dolomite fizzes only very slowly. Here are some pictures made in a more controlled setting.
Images 1-5 of 5
 Passing the Acid Test |  Mystery Carbonate |  Calcite Test Fails |  Crushed Carbonate Mineral |
 Dolomite Passes the Acid Test |
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