Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone and Mineral Specimen
Crystal System
Trigonal, crystal habit is prismatic forming as a druzy cluster or crystal points terminating in six-sided pyramids
Mineral Group
Silicates, specifically Tectosilicates
Chemical Formula
SiO2
Formation Process
Hydrothermal origin, typically forming inside hollow cavities of volcanic rocks (vugs or geodes) from silica-rich solutions at low to moderate temperatures
About This Crystal
A small purple quartz cluster featuring translucent to transparent terminated crystal points with vitreous luster, displaying color zoning from pale lavender to deep violet
Physical Characteristics
Color is purple to violet, white streak, no cleavage, conchoidal fracture, specific gravity of 2.65, brittle tenacity, and piezoelectric properties
Optical Properties
Singly or doubly refractive with a refractive index of 1.544 to 1.553, uniaxial positive optical character, and weak pleochroism showing reddish-purple and bluish-purple
Hardness & Durability
Origin Region
Brazil, Uruguay, Madagascar, Zambia, and the United States
Hardness & Durability
Mohs hardness of 7, fair to good toughness, stable under normal conditions but can fade with prolonged exposure to high heat or direct sunlight
Care & Maintenance
Clean with warm soapy water using a soft brush, avoid harsh chemicals, ultrasonic cleaners, and steam cleaners, and store away from direct sunlight and harder stones
Rarity & Value
Common to uncommon depending on color saturation and clarity, value is determined by deep purple color saturation, transparency, and size, price range is generally affordable for small specimens
Special Characteristics
Displays color zoning, natural terminations, and piezoelectric properties when mechanical stress is applied
Lore & History
Historically used by ancient Greeks and Romans to prevent intoxication, associated with royalty, and commonly used in modern crystal healing to represent the third eye and crown chakras for spiritual growth and calm