Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal, with a macrocrystalline habit forming prismatic crystals that terminate in six-sided pyramids, though this specimen is polished into spherical beads
Mineral Group
Silicates (specifically Tectosilicates)
Chemical Formula
SiO2
Formation Process
Hydrothermal and magmatic processes, where silica-rich fluids deposit quartz in cavities of volcanic rocks at low to moderate temperatures, with color imparted by natural irradiation of trace iron impurities
About This Crystal
The specimen is a stretch bracelet composed of smoothly polished, spherical beads exhibiting deep purple to violet coloration, varying from translucent to opaque with characteristic subtle color zoning and internal cloud-like inclusions typical of natural quartz
Physical Characteristics
Deep purple body color with a white streak, conchoidal fracture, lack of distinct cleavage, specific gravity of approximately 2.65, brittle tenacity, and no notable magnetism or strong fluorescence
Optical Properties
Uniaxial positive with a refractive index of 1.544 to 1.553, showing weak birefringence and faint pleochroism in shades of purple and reddish-purple
Hardness & Durability
Origin Region
Notable sources include Brazil, Uruguay, Madagascar, Zambia, and the United States, typically forming in volcanic rock cavities or hydrothermal veins
Hardness & Durability
Mohs hardness of 7, making it durable for daily jewelry wear, with good resistance to scratching though vulnerable to thermal shock and harsh impacts
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic or steam cleaners, prolonged exposure to direct sunlight which can cause fading, and contact with harsh chemicals
Rarity & Value
Common to moderately uncommon depending on saturation and clarity, with value driven by deep purple color saturation, lack of visible inclusions, and large size; widely available as tumbled stones and beaded jewelry with generally affordable pricing
Special Characteristics
Natural color zoning, phantom layers, or fluid inclusions are sometimes visible, and the material exhibits piezoelectric and pyroelectric properties under mechanical stress or temperature change
Lore & History
Historically worn by ancient Greeks and Romans to prevent intoxication, Amethyst has long symbolized royalty, clarity, and inner peace; in modern crystal healing, it is traditionally associated with the third eye and crown chakras to promote spiritual growth and tranquility