Discussion
Put these minerals in order of increasing hardness.
1. Quartz 2. Gypsum 3. Calcite 4. Fluorite
Answer: D
Correct answer: 2, 3, 4, 1
The Mohs scale places gypsum at 2, calcite at 3, fluorite at 4 and quartz at 7, so the order is simply that. Four of the ten standard minerals appear here, and the gap between fluorite and quartz is where the useful field tests - the knife and the glass, both about 5.5 - fall.
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