Chevron Amethyst
Quartz var. Amethyst (IMA-approved name: Quartz) · Decorative Stone and Semi-Precious Gemstone carved specimen
Crystal System
Trigonal; typically forms prismatic crystals ending in a six-sided pyramid, but in this specimen, it has been carved into a human skull shape
Mineral Group
Silicate mineral group, specifically Tectosilicates
Chemical Formula
SiO2 with trace iron (Fe3+) impurities and characteristic white quartz banding
Formation Process
Hydrothermal and magmatic processes. Forms when silica-rich solutions deposit quartz in cavities at low to moderate temperatures, with rhythmic fluctuations producing the characteristic V-shaped chevron growth patterns.
About This Crystal
This carved specimen is shaped into a human skull, displaying distinct V-shaped bands (chevrons) of deep purple amethyst alternating with opaque white milky quartz. It has a high-polish vitreous luster and translucent to opaque transparency.
Physical Characteristics
Color ranges from deep violet to pale lavender with white quartz bands; streak is white; no true cleavage (conchoidal fracture); specific gravity is approximately 2.65; brittle tenacity; exhibits piezoelectric properties.
Optical Properties
Doubly refractive with a uniaxial positive optical sign; refractive index of 1.544 to 1.553; birefringence of 0.009; pleochroism is weak to moderate in shades of reddish-purple and bluish-purple.
Hardness & Durability
Origin Region
Notable sources include Brazil, Madagascar, South Africa, and the USA. Forms in igneous, metamorphic, and sedimentary environments, primarily within hydrothermal veins and gas cavities in volcanic rocks (geodes).
Hardness & Durability
Mohs hardness of 7; fair toughness due to lack of cleavage, but prone to fracturing under severe impact; suitable for jewelry and decorative carvings with normal wear.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic or steam cleaners if fractures are present. Store away from direct sunlight to prevent color fading and keep separate from harder stones to avoid scratching.
Rarity & Value
Common to uncommon depending on the intensity of the purple color and definition of the chevron pattern; heavily traded as polished mineral specimens and carvings, with prices varying based on size and carving quality.
Special Characteristics
Features striking geometric chevron and zigzag banding patterns resulting from alternating growth phases of amethyst and white quartz, highly prized in carved decorative objects.
Lore & History
Amethyst has been used as a gemstone since ancient times, valued by the Greeks, Romans, and Egyptians for adornment and amulets. In modern crystal healing, chevron amethyst is traditionally believed to combine the strengthening and enhancing qualities of quartz with the stress-relieving properties of amethyst, often associated with the third eye and crown chakras. These are traditional cultural beliefs and not scientific claims.