Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal, typically forming prismatic crystals terminated by six-sided pyramids
Mineral Group
Silicates (Tectosilicates)
Chemical Formula
SiO2
Formation Process
Hydrothermal and magmatic processes, typically forming within volcanic rock cavities, geodes, and pegmatites
About This Crystal
A polished, translucent to transparent purple crystal tower with visible internal fractures, cloudiness, and color zoning ranging from pale lilac to deep violet
Physical Characteristics
Purple color with white streak, conchoidal fracture, lack of distinct cleavage, specific gravity of approximately 2.65, brittle tenacity, vitreous luster
Optical Properties
Singly refractive or anomalous uniaxial positive, low birefringence of 0.009, weak pleochroism showing reddish-purple and bluish-purple
Hardness & Durability
Origin Region
Brazil, Uruguay, Madagascar, Zambia, and the United States
Hardness & Durability
Mohs hardness of 7, making it durable for daily wear in jewelry with careful handling, resistant to scratching by most common materials
Care & Maintenance
Clean with warm soapy water and a soft brush, avoid harsh chemicals, prolonged exposure to direct sunlight which can cause fading, and sudden temperature shocks
Rarity & Value
Common to moderately rare depending on saturation, clarity, and origin; widely available as tumbled stones, polished points, and geodes
Special Characteristics
Displays natural color zoning and internal phantom-like inclusions, piezoelectric and pyroelectric properties
Lore & History
Historically worn to prevent drunkenness and ensure a clear mind in ancient Greece and Rome; traditionally associated with the third eye and crown chakras, promoting calm, spiritual growth, and emotional balance