Question

The axial relationship of a monoclinic crystal system is given as ___________

(a) a = b = c

(b) a = b ≠ c

(c) a ≠ b = c

(d) a ≠ b ≠ c

I had been asked this question in final exam.

Question is taken from Types of Solids, Crystal Structures and Lattices topic in chapter Solid Solutions & Crystallography of Engineering Material & Metallurgy

Answer 1

Right answer is (d) a ≠ b ≠ c

For explanation: The crystal system is a format by which crystal structures are classified.  Each crystal system is defined by the relationship between edge lengths a, b, and c. For monoclinic, orthorhombic, and triclinic systems, the axial relationship is given by a ≠ b ≠ c.