Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal, massive or crystalline habit
Mineral Group
Silicates (Tectosilicates)
Chemical Formula
SiO2
Formation Process
Hydrothermal veins and volcanic cavities (geodes) at low to moderate temperatures
About This Crystal
A raw, unpolished crystal fragment showing translucent to transparent purple coloration with minor brownish-yellow iron oxide matrix staining. Vitreous luster on fractured faces.
Physical Characteristics
Purple body color, white streak, conchoidal fracture, lack of cleavage, specific gravity of 2.65, brittle tenacity
Optical Properties
Uniaxial positive, doubly refractive, weak dichroism in shades of purple
Hardness & Durability
Origin Region
Brazil, Uruguay, Madagascar, Zambia
Hardness & Durability
Mohs hardness of 7, good wearability for jewelry despite lacking cleavage, moderate toughness
Care & Maintenance
Clean with warm soapy water, avoid prolonged exposure to direct sunlight to prevent fading, avoid harsh chemicals and sudden temperature shocks
Rarity & Value
Common to moderately rare depending on color saturation and clarity; widely accessible with affordable pricing for raw specimens
Special Characteristics
Piezoelectric properties, color zoning visible as alternating light and dark purple bands
Lore & History
Historically used by ancient Greeks and Romans to prevent intoxication, associated with calmness, spiritual growth, and the third eye and crown chakras in modern crystal healing