Chevron Amethyst
Quartz var. Amethyst (IMA-approved name: Quartz) · Semi-Precious Gemstone and decorative tumbled stone
Crystal System
Trigonal crystal system, typically forming as prismatic crystals terminated by a rhombohedron, but presented here as a tumbled, polished smooth pebble (massive/banded habit)
Mineral Group
Silicate mineral group, specifically belonging to the tectosilicate subgroup
Chemical Formula
SiO2 with trace iron impurities causing the purple coloration and white quartz banding
Formation Process
Hydrothermal and magmatic processes, where silica-rich fluids deposit quartz in cavities at low to moderate temperatures, alternating with white quartz deposition to create the characteristic chevron pattern.
About This Crystal
A smooth, tumbled pebble displaying a striking chevron pattern of deep purple amethyst intergrown with milky white quartz in distinct V-shaped or striped bands. It has a polished, glossy surface and a semi-translucent to opaque appearance.
Physical Characteristics
Colors include deep purple and white; white streak; no true cleavage; conchoidal fracture; specific gravity of approximately 2.65; brittle tenacity; exhibits piezoelectricity and is generally inert under UV light.
Optical Properties
Doubly refractive with a uniaxial positive optical character, refractive index ranging from 1.544 to 1.553, low birefringence of 0.009, and weak or absent pleochroism.
Hardness & Durability
Origin Region
Found globally with notable sources in Brazil, Madagascar, South Africa, and India. Forms in hydrothermal veins and cavities within volcanic and metamorphic rocks.
Hardness & Durability
Mohs hardness of 7, making it durable for daily jewelry wear, though care should be taken against heavy impacts due to its brittle nature.
Care & Maintenance
Safe to clean with warm soapy water; avoid ultrasonic cleaners and steam if fractures are present. Store away from prolonged direct sunlight to prevent the purple color from fading.
Rarity & Value
Common and widely accessible, with very affordable pricing for tumbled stones, though high-grade banded material with sharp chevrons is increasingly valued by collectors.
Special Characteristics
Distinctive natural geometric banding (chevron or dogtooth pattern) combining amethyst and milky quartz, often used for focus and visualization in lapidary arts.
Lore & History
Historically associated with inner peace, spiritual growth, and clarity. Traditionally linked to the Third Eye and Crown chakras in modern crystal healing, though these are cultural beliefs rather than scientific claims.