Question

Which is the less important and more important and less important minerals crystallize respectively?

(a) Triclinic and monoclinic

(b) Monoclinic and triclinic

(c) Monoclinic and rhombohedral

(d) Rhombohedral and triclinic

This question was addressed to me by my college professor while I was bunking the class.

My enquiry is from Formation and Descriptive Study of Minerals in portion The Study of Minerals of Engineering Geology

Answer 1

Right option is (b) Monoclinic and triclinic

The explanation: Most important members of the Mica group crystallize in one system only: Monoclinic system. Some less important members crystallize in triclinic system.