Discussion
Effervescence with dilute hydrochloric acid identifies a mineral as a
Answer: A
Correct answer: carbonate
Dilute hydrochloric acid liberates carbon dioxide from a carbonate, producing the visible effervescence. It is the quickest field test there is, and it separates calcite and the limestones from everything else at a stroke. Dolomite is the qualification: being a carbonate it reacts, but only slowly unless powdered or warmed.
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