question_answer

Which one of the following pairs of axis lengths (a, b, c) and interaxial angles \[(\alpha ,\,\beta ,\,\gamma )\] represents the tetragonal crystal system?

A) \[a=b=c;\,\alpha =\beta =\gamma =90{}^\circ \]

B) \[a=b\ne c;\,\alpha =\beta =\gamma =90{}^\circ \]

C) \[a\ne b\ne c;\,\alpha =\beta =\gamma =90{}^\circ \]

D) \[a=b=c;\,\alpha =\beta =\gamma \ne 90{}^\circ \]