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The mica group minerals show which structure in the microscopic level?

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The mica group minerals show which structure in the microscopic level?

(a) Box structure

(b) Sheet structure

(c) Hexagonal structure

(d) Columnar structure

This question was posed to me in final exam.

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

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The correct answer is (b) Sheet structure

The explanation is: The micaceous cleavage is explained by their atomic structure: they constitute of SiO4 tetrahedra linked at three of their corners and extending in two dimensions. This is called a sheet structure.

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