You are watching: What does the acid test tell you about a mineral
The mineral is put in acid. Calcite bubbles easily in cold acid. This is not calcite.
The most common white mineral in the calcite group react in different ways to cold and hot acid, together follows:
Calcite (CaCO3): bubbles strongly in cold acidMagnesite (MgCO3): bubbles just in hot acidSiderite (FeCO3): bubbles only in hot acidSmithsonite (ZnCO3): bubbles just in hot acid
Calcite is by far the most usual in the calcite group, and also is the just one that frequently looks favor our specimen. However, we understand it isn't calcite. Sometimes magnesite occurs in white granular masses like our specimen, yet the key suspect is dolomite (CaMg(CO3)2), i beg your pardon is no in the calcite family. It bubbles weakly in cold acid, strongly in hot acid. Due to the fact that we're using weak vinegar, we will pulverize the specimen to make the reaction faster.
Crushed carbonate Mineral
The an enig mineral is ground in a hand mortar. The well-formed rhombs room a sure authorize of a lead carbonate mineral.
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Dolomite in Acetic acid
Powdered dolomite bubbles tenderness in cold hydrochloric acid and also in warm vinegar. Hydrochloric acid is much preferred since the reaction through dolomite is otherwise very slow.