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June 1, 2007, Newsletter Issue #142: Effervescence
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Tip of the Week
Most minerals donīt react with acid, but carbonate minerals like calcite or dolomite, do. Calcite and dolomite can look alike, but you can differentiate between them using acid. If you drop some weak acid (even vinegar will do) on a piece of calcite, it will foam, fizz, or otherwise effervese. Dolomite, on the other hand, will only fizz on fresh surfaces, so you have to scratch the dolomite first, and drop the acid on the scratch.
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