Chevron Amethyst
Quartz var. Chevron Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal system, massive or microcrystalline quartz habit often showing distinct V-shaped growth banding
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 with trace iron and aluminum
Formation Process
Hydrothermal and magmatic processes, where silica-rich fluids deposit quartz within cavities alongside white quartz layers under moderate temperatures and pressures
About This Crystal
A polished cabochon displaying a distinctive pattern of alternating dark violet and white bands, often forming characteristic V-shaped chevron or striped motifs. The specimen is translucent to opaque with a vitreous to waxy luster when polished
Physical Characteristics
Purple and white body color with a white streak. Conchoidal fracture, no true cleavage, specific gravity of approximately 2.65, brittle tenacity, and generally non-fluorescent
Optical Properties
Uniaxial positive with a refractive index of 1.544 to 1.553, showing weak birefringence and no significant pleochroism in massive banded forms
Hardness & Durability
Origin Region
Brazil, Madagascar, South Africa, and India; commonly forms in hydrothermal veins and vugs within volcanic rocks
Hardness & Durability
Mohs hardness of 7, good durability for jewelry wear though susceptible to scratching by harder materials like corundum and topaz
Care & Maintenance
Clean with warm soapy water using a soft brush. Avoid harsh chemical cleaners, ultrasonic cleaners if fractures are present, and prolonged exposure to direct sunlight which can cause the purple color to fade
Rarity & Value
Common to uncommon; value is determined by the clarity and high contrast of the chevron banding, typically ranging from inexpensive tumbling grade to moderately priced decorative cabochons
Special Characteristics
Displays sharp zoning and geometric band patterns resulting from alternating phases of amethyst and milky quartz deposition during crystal growth
Lore & History
Historically associated with spiritual balance and third-eye activation in modern metaphysical practices. Believed by practitioners to combine the strengthening qualities of quartz with the spiritual enhancement of amethyst, though these are traditional beliefs rather than scientific claims