Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal, shaped into a machine-cut hexagonal faceted pendant habit
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2
Formation Process
Hydrothermal and magmatic crystallization inside gas cavities (vesicles) in basaltic rocks at low to moderate temperatures
About This Crystal
A polished, hexagonal pointed pendant made of light purple quartz, featuring internal cloudiness, inclusions, and subtle color zoning characteristic of natural amethyst quartz
Physical Characteristics
Pale to medium purple body color, white streak, conchoidal fracture, lack of distinct cleavage, specific gravity of approximately 2.65, brittle tenacity
Optical Properties
Uniaxial positive with a refractive index of 1.544 to 1.553, double refraction, weak pleochroism showing reddish-purple and bluish-purple shades
Hardness & Durability
Origin Region
Global distribution with notable sources in Brazil, Uruguay, Madagascar, and Zambia; forms in hydrothermal veins and volcanic cavities
Hardness & Durability
Mohs hardness of 7, good durability for everyday jewelry wear though vulnerable to sharp impacts due to lack of cleavage and brittle tenacity
Care & Maintenance
Clean with warm soapy water using a soft brush, avoid harsh chemical cleaners, ultrasonic cleaners are generally safe but steam cleaning should be avoided, store away from prolonged direct sunlight to prevent color fading
Rarity & Value
Common, value is determined by color saturation, clarity, and cut, widely accessible with affordable pricing for mass-produced crystal point jewelry
Special Characteristics
Displays natural color zoning and internal phantom-like inclusions typical of quartz crystal growth, exhibits piezoelectric properties
Lore & History
Historically used by ancient Greeks and Romans as a talisman against drunkenness and to keep the wearer clear-headed, widely associated in modern crystal healing with the third eye and crown chakras to promote inner peace and calm