How to Tell If Quartz Crystals Are Real | Our
Quartz has a hardness of 7 on the Mohs scale, meaning that it will easily scratch glass, metals and softer stones. This test will not harm the crystal if it is real quartz because glass has a hardness of to Martin Novak/iStock/Getty Images . Clean the surface of the glass, with a streakfree glass cleaner. Completely dry the surface with paper towels. afitz/iStock/Getty Images