Quiz: Chapter 3 Quiz: M Question 18 1 pts What is the special property that allo

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Quiz: Chapter 3 Quiz: M Question 18 1 pts What is the special property that allows one to identify calcite versus dolomite, the very similar carbonate minerals? Calcite has three planes of cleavage at 60 and 120 degrees, whereas dolomite has three planes of cleavage at 90 degrees. Dolomite is significantly harder than calcite, which can easily be tested using common materials. O Calcite has three planes of cleavage at 60 and 120 degrees, whereas dolomite has two planes of cleavage at 60 and 120 degrees. O calcite effervesces (fizzes) readily when dilute HCl solution is applied. Dolomite only effervesces in dilute HCI solution when it is first turned into powder Dolomite effervesces (fizzes) readily when HCI is applied. 1 pts Question 19

Explanation / Answer

18) C

Calcite and dolomite are very similar minerals.

Both have the same hardness (H = 3), the same rhombohedral cleavage, and are found in identical geologic settings.

The best way to tell one from the other is the acid test: a drop of 1 M HCl on calcite produces an instant, obvious fizz; a drop on dolomite produces slow or no obvious bubbling. For dolimite to give effervesces it must be turned into powder.

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