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Which of the following is not true about plagioclase?

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Which of the following is not true about plagioclase?

(a) It is composed of K mainly

(b) It is composed of either Na, Ca, or Al

(c) It is of massive or crystalline structure

(d) It gives 2 sets of cleavages

The question was posed to me in exam.

This interesting question is from Formation and Descriptive Study of Minerals in division The Study of Minerals of Engineering Geology

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Right choice is (a) It is composed of K mainly

Best explanation: Plagioclase is usually composed of either Na or Ca or Al or combination of them. K is present in orthoclase and not in plagioclase.

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