Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal, typically occurring as tumbled smooth pebble or massive habit in this polished form
Mineral Group
Silicates, Tectosilicates
Chemical Formula
SiO2
Formation Process
Hydrothermal activity and cavity filling in volcanic rocks at low to moderate temperatures
About This Crystal
Small, smooth, polished tumbled stone with translucent to semi-transparent clarity, exhibiting shades of purple and violet color zoning with a vitreous to waxy luster
Physical Characteristics
Purple body color, white streak, conchoidal fracture, cleavage absent, specific gravity around 2.65, brittle tenacity
Optical Properties
Uniaxial positive optical character, doubly refractive, weak to moderate pleochroism in reddish-violet and bluish-violet
Hardness & Durability
Origin Region
Global distribution including Brazil, Madagascar, Uruguay, and Zambia, commonly found in volcanic rock cavities
Hardness & Durability
Mohs hardness of 7, fair toughness due to lack of cleavage, moderate stability suitable for everyday jewelry with proper care
Care & Maintenance
Clean with warm soapy water using a soft brush, avoid prolonged direct sunlight to prevent color fading, keep away from harsh chemicals and sudden thermal shock
Rarity & Value
Common to abundant, highly accessible, value determined by color saturation, transparency, and freedom from inclusions, inexpensive in tumbled form
Special Characteristics
Piezoelectric properties, color zoning visible as alternating bands of light and dark purple
Lore & History
Historically associated with royalty, sobriety, and clarity of mind, widely used in modern crystal healing to connect with the third eye and crown chakras