Quartz is the second-most-abundant mineral in the Earth's continental crust, after feldspar. Even though the purest form of quartz is essentially colorless, either transparent or slightly clouded, there are innumerable varieties of quartz that are diversely hued and can be found all over the world, no matter what the temperature conditions of a place are.

Quartz is the second-most-abundant mineral in the Earth's continental crust, after feldspar. Even though the purest form of quartz is essentially colorless, either transparent or slightly clouded, there are innumerable varieties of quartz that are diversely hued and can be found all over the world, no matter what the temperature conditions of a place are.