coelestisinfestus: Amethyst (Quartz) Trigonal crystal habit 7 hardness, but lower in less pure forms Conchoidal (shell-like fracture) 2.65 specific gravity White streak Vitreous luster Quartz comes from an old German word for ‘hard,’ twarc. It has a ton of different varieties, but amethyst is one of the most well known. It’s also the birthstone forContinue reading