Chevron Amethyst
Quartz var. Amethyst (IMA-approved name: Quartz) · Semi-Precious Gemstone
Crystal System
Trigonal system; massive or microcrystalline quartz habit combined with crystalline growth zones, often tumbling into smooth rounded pebbles.
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2 with trace iron impurities (Fe3+)
Formation Process
Hydrothermal and magmatic processes where silica-rich fluids deposit quartz in rock cavities at low to moderate temperatures, incorporating iron and undergoing natural irradiation to produce purple color banding.
About This Crystal
A polished, tumbled specimen displaying distinct V-shaped or chevron-like bands of deep purple amethyst intergrown with milky white quartz, featuring earthy brownish-yellow matrix inclusions.
Physical Characteristics
Colors include purple, white, and brown; white streak; no true cleavage; conchoidal fracture; specific gravity of approximately 2.65; brittle tenacity; displays piezoelectricity.
Optical Properties
Uniaxial positive optical character; refractive index of 1.544 to 1.553; birefringence of 0.009; doubly refractive; vitreous luster.
Hardness & Durability
Origin Region
Found globally with major deposits in Brazil, Madagascar, South Africa, and India. Forms in hydrothermal veins and cavities within volcanic rocks.
Hardness & Durability
Mohs hardness of 7; fair to good toughness; stable under normal conditions, making it suitable for everyday jewelry wear.
Care & Maintenance
Clean with warm soapy water using a soft brush; avoid harsh chemicals and prolonged direct sunlight to prevent color fading.
Rarity & Value
Common and widely accessible; value depends on the sharpness of the chevron pattern, color saturation, and lack of fractures. Inexpensive in tumbled form.
Special Characteristics
Distinctive chevron or dogtooth banding pattern formed by alternating layers of amethyst and white quartz.
Lore & History
Historically used as a protective talisman and symbol of sobriety; in modern crystal healing, it is associated with the third eye and crown chakras for enhancing intuition and spiritual clarity.