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What is the distinguishing characteristic of microcline and orthoclase?

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What is the distinguishing characteristic of microcline and orthoclase?

(a) Colour

(b) Streak

(c) Chemical composition

(d) Hardness

The question was asked in final exam.

My question is from Formation and Descriptive Study of Minerals in section The Study of Minerals of Engineering Geology

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The correct option is (b) Streak

To explain I would say: Both orthoclase and microcline have same colour but microcline gives white streak whereas, orthoclase does not give any streak. Chemical composition and hardness are almost same for both the minerals.

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