Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal, typically cut into a six-sided prismatic point or pendant habit
Mineral Group
Silicates, specifically Tectosilicates
Chemical Formula
SiO2 with trace iron impurities
Formation Process
Hydrothermal and magmatic processes, forming in cavities within volcanic rocks at low to moderate temperatures from silica-rich solutions.
About This Crystal
A polished, deep purple gemstone pendant carved into a terminated hexagonal prism shape with a metal bail. It exhibits rich violet coloration with darker internal fractures and webbing inclusions, translucent to semi-transparent clarity, and a vitreous luster.
Physical Characteristics
Color ranges from pale lilac to deep purple; streak is white; no true cleavage (exhibits conchoidal fracture); specific gravity is approximately 2.65; brittle tenacity; displays piezoelectric properties.
Optical Properties
Uniaxial positive optical character; refractive index ranges from 1.544 to 1.553; birefringence of 0.009; faintly pleochroic showing reddish-purple and bluish-purple.
Hardness & Durability
Origin Region
Globally distributed; notable sources include Brazil, Uruguay, Madagascar, and Zambia. Typically forms in volcanic rock cavities or hydrothermal veins.
Hardness & Durability
Mohs hardness of 7, making it durable enough for everyday jewelry wear though susceptible to scratching softer materials or being scratched by quartz-harder minerals.
Care & Maintenance
Clean with warm soapy water using a soft brush; avoid harsh chemicals and prolonged exposure to direct sunlight which can cause the purple color to fade; store separately in a soft pouch.
Rarity & Value
Common to moderately rare depending on saturation and clarity; heavily commercially available as mass-produced tumbled stones and carved crystal points. Synthetic versions and heat-treated citrine are common in the market.
Special Characteristics
Displays natural color zoning and dark internal feather or fracture inclusions, typical of natural quartz varieties.
Lore & History
Historically used in ancient Greek and Roman societies as a talisman against drunkenness and to keep the wearer clear-headed. In modern crystal healing, it is associated with the Third Eye and Crown chakras, symbolizing spiritual growth, calmness, and protection.