Question

What is rock salt ? why is it brown in color.

Answer 1

However other geological influences mean the rock salt's colour can sometimes go from clear, to pink, to dark brown. Rock salt is brown in colour due to the impurities present in it. when the salt is in crystal form ,it is known as rock salt.Rock salt is brown in colour due to the impurities present in it.

Answer 2

${\red{\textbf{Rock\:Salt}}}$

Halite more commonly known as Rock salt.
Rock salt is the mineral form of Sodium bicarbonate ( NaHCo3 ) solution.The salt occurs in beds of sedimentary evaporite minerals. This is caused by large lakes and seas drying up.
It is a basic solution and we know that ages died up.They are brown in color due to impurities.