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What is the chemical composition of Orthoclase?

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What is the chemical composition of Orthoclase?

(a) K Al O8

(b) Ca Al Si3O8

(c) K Al Si3 O8

(d) Ca Al O8

This question was posed to me in unit test.

The question is from Formation and Descriptive Study of Minerals topic in portion The Study of Minerals of Engineering Geology

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The correct option is (c) K Al Si3 O8

Easy explanation: Orthoclase mineral has the specific gravity around 2.56 to 2.58. Its chemical composition is K Al Si3O8. It is the most common and essential constituent of many igneous rocks, especially granite.

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