Question

Mica is also called brown diamond.

Hint:

Brown diamond refers to lignite, not mica.

Answer 1

Mica is not known as the brown diamond. Mica is a mineral used in electrical and electronic industries due to its insulating properties. The name "brown diamond" is popularly associated with lignite, a low-grade brown coal, not mica. Mica occurs in thin sheets and has a shiny appearance, but it is not categorized or nicknamed as brown diamond in any geological or industrial classification.