Discussion
Consider the following statements about rock-forming minerals.
1. Streak is more reliable than colour 2. Montmorillonite swells more than kaolinite 3. Quartz shows perfect cleavage
Answer: A
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: streak is the colour of the powder and is free of the effects that make apparent colour unreliable, and montmorillonite swells far more than kaolinite because water enters between its layers. Statement 3 is wrong - quartz has no cleavage at all, its framework structure offering no plane of weakness.
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