Image: <a href="//commons.wikimedia.org/wiki/User:EvaK" title="User:EvaK">Eva K.</a> (GFDL 1.2)
trigonalcommonSilicates
Amethyst
SiO2
Amethyst is a purple variety of quartz, typically forming prismatic crystals often found lining geodes or vugs, displaying a range of violet hues from pale lavender to deep purple.
Amethyst Physical Properties
Mohs Hardness
7Crystal System
trigonalLuster
vitreousStreak Color
whiteCleavage
noneFracture
conchoidalSpecific Gravity
2.65Colors
purple, violet, lavenderTransparency
transparentType Locality
Brazil (Rio Grande do Sul), Uruguay, Zambia, Russia (Urals)Mineral Group
SilicatesUses
jewelry, ornamental, collector specimens, spiritual/healing practicesAssociated Minerals
calcite, zeolites, goethite, hematite, other quartz varietiesRarity
commonGeological Context
It forms in hydrothermal veins and vugs within igneous rocks, particularly basaltic lavas, where silica-rich solutions deposit quartz crystals colored by iron impurities and natural irradiation.
