DENSITY: 2.6 g / cm3
BRIGHTNESS: Between waxy and vitreous
EXFOLIATIONN- FRACTURE: None - Conchoidal
CRYSTALLISATION: Trigonal System
TRANSPARENCYTransparent, often translucent
Amethyst is a macro-crystalline quartz variety. Tetrahedral crystals, botryoidal aggregates and compact masses. Its characteristic violet color can be more or less intense according to the amount of iron it contains. Although very resistant to acids is very supceptible heat. In fact when heated to over 300 ° C its color changes to brown, dun, yellow or green, depending on its quality and its place of origin.