Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal, with prismatic habit often terminated by rhombohedrons
Mineral Group
Silicate, specifically a tectosilicate
Chemical Formula
SiO2
Formation Process
Hydrothermal and magmatic processes, typically forming within volcanic cavities, geodes, and pegmatites at low to moderate temperatures
About This Crystal
The specimens are raw, tumbled, or minimally polished crystal pendants showing shades of purple and violet color zoning, ranging from translucent to transparent with a vitreous luster
Physical Characteristics
Purple body color, white streak, conchoidal fracture, lack of distinct cleavage, specific gravity of approximately 2.65, brittle tenacity, and piezoelectric properties
Optical Properties
Singly refractive to uniaxial positive with weak birefringence, generally displaying faint pleochroism in reddish-violet and bluish-violet shades
Hardness & Durability
Origin Region
Brazil, Uruguay, Madagascar, Zambia, and the United States
Hardness & Durability
Mohs hardness of 7, making it durable for daily jewelry wear, though care must be taken against impact due to brittle tenacity and lack of cleavage
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic cleaners and harsh chemicals; store away from prolonged direct sunlight to prevent fading
Rarity & Value
Common to moderately rare depending on saturation and clarity, with value driven by deep purple color, transparency, and size; heat treatments are occasionally used to produce citrine or green quartz
Special Characteristics
Color zoning is often visible, along with natural inclusions, phantom growth lines, and piezoelectric properties
Lore & History
Historically worn by ancient Greeks and Romans to prevent intoxication and associated with royalty; in modern crystal healing, it is traditionally linked to the third eye and crown chakras for spiritual growth and calming energy