Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal, typically forming prismatic crystals terminated by six-sided pyramids
Mineral Group
Silicates, specifically Tectosilicates
Chemical Formula
SiO2 with trace amounts of iron (Fe3+)
Formation Process
Hydrothermal activity and cavity filling in volcanic rocks at low to moderate temperatures
About This Crystal
A translucent to transparent violet-to-purple gemstone with a vitreous luster, showcasing natural color zoning typical of quartz crystals
Physical Characteristics
Purple body color, white streak, conchoidal fracture, no true cleavage, specific gravity of approximately 2.65, brittle tenacity
Optical Properties
Uniaxial positive optic sign, refractive index of 1.544 to 1.553, weak birefringence, and faint pleochroism in reddish-violet and bluish-violet
Hardness & Durability
Origin Region
Brazil, Uruguay, Madagascar, Zambia, and the United States
Hardness & Durability
Mohs hardness of 7, making it durable enough for everyday jewelry wear, though prone to scratching softer surfaces
Care & Maintenance
Clean with warm soapy water using a soft brush; avoid prolonged exposure to direct sunlight to prevent color fading and keep away from harsh chemicals
Rarity & Value
Common to moderately rare depending on color saturation and clarity; valued based on deep purple hues and minimal inclusions
Special Characteristics
Exhibits natural color zoning, sometimes piezoelectric properties, and faint thermal sensitivity
Lore & History
Historically used in ancient jewelry and amulets to prevent intoxication and promote clarity of mind; associated with the third eye and crown chakras in modern crystal lore