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Diluted hydrochloric acid is used to test for carbonate minerals such as calcite. Which rock showed evidence of carbonate minerals? A. Marble B. Obsidian C. Quartz D. Gneiss

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Answer:

A. Marble  

Explanation:

Marble is mostly a crystalline form of calcium carbonate, CaCO3. Marble is a carbonate mineral, so it should give a positive test.  

B. and C. are wrong. Quartz is a crystalline form of SiO₂ and obsidian is a volcanic glass consisting mostly of SiO₂.

D. is wrong. Gneiss is a complex mixture  of quartz, aluminosilicate crystals, various metal silicates, and other noncarbonate minerals.

1700JOKER

Answer:

A) Marble

Explanation:

Limestone and marble (which is metamorphosed limestone) both have significant amounts of calcite. When tested with hydrochloric acid, rocks containing calcite or other carbonate minerals will fizz and produce bubbles.