Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal, with a hexagonal crystal system framework; typically forms as prismatic crystals terminating in rhombohedra, but often encountered as massive, tumbled, or geode formations.
Mineral Group
Silicate, specifically a tectosilicate
Chemical Formula
SiO2
Formation Process
Hydrothermal and magmatic processes, precipitating from silica-rich solutions at low to moderate temperatures within volcanic gas cavities (geodes).
About This Crystal
The specimen is a beaded bracelet composed of tumbled, polished Amethyst stones displaying a distinct range of purple shades combined with milky white chevron banding (Chevron Amethyst). The beads are translucent to opaque with a vitreous to waxy luster typical of polished quartz.
Physical Characteristics
Color ranges from pale lilac to deep violet with characteristic white bands; white streak; no cleavage; conchoidal fracture; specific gravity of approximately 2.65; brittle tenacity; exhibits piezoelectric properties.
Optical Properties
Uniaxial positive optical character; refractive index of 1.544 to 1.553; birefringence of 0.009; generally low pleochroism visible as reddish-violet and bluish-violet in deep specimens.
Hardness & Durability
Origin Region
Brazil, Uruguay, Madagascar, Zambia, and the United States; forms in volcanic rock cavities, hydrothermal veins, and metamorphic rocks.
Hardness & Durability
Mohs hardness of 7; good durability for everyday jewelry wear, though prone to scratching softer materials and being scratched by harder minerals like topaz or corundum.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid harsh chemicals and prolonged direct sunlight, which can cause the purple color to fade over time.
Rarity & Value
Common to moderately rare depending on color saturation and clarity; tumbled bead bracelets are generally affordable and widely accessible.
Special Characteristics
Features striking chevron-style banding patterns formed by alternating layers of purple amethyst and white quartz growth zones.
Lore & History
Historically used in ancient jewelry and as a talisman against intoxication by the Greeks and Romans. In modern metaphysical practices, it is associated with the third eye and crown chakras, promoting clarity, spiritual growth, and tranquility.