Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal, typically forms in massive, tumbled, or prismatic habits
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2
Formation Process
Hydrothermal and magmatic processes, typically crystallizing from silica-rich solutions in cavities of volcanic rocks at low to moderate temperatures
About This Crystal
A small tumbled and polished pebble featuring deep purple color zones fading into lighter violet and milky white quartz inclusions, displaying a smooth, vitreous to waxy luster and translucent to semi-transparent clarity.
Physical Characteristics
Purple body color with white zonal banding, white streak, conchoidal fracture, no true cleavage, specific gravity of approximately 2.65, brittle tenacity, and generally inert under UV light though occasionally showing faint green or yellow fluorescence
Optical Properties
Uniaxial positive, doubly refractive with a low birefringence of 0.009, and refractive index ranging from 1.544 to 1.553, showing weak pleochroism in purplish-red and reddish-violet
Hardness & Durability
Origin Region
Found globally with major deposits in Brazil, Uruguay, Madagascar, and Zambia; forms in volcanic cavities and hydrothermal veins
Hardness & Durability
Mohs hardness of 7, making it durable and suitable for everyday jewelry wear, with good toughness and no cleavage planes to worry about
Care & Maintenance
Clean with warm soapy water using a soft brush, avoid harsh chemicals or ultrasonic cleaners, and store away from prolonged direct sunlight to prevent color fading
Rarity & Value
Common and widely accessible, with value determined by color saturation, clarity, and size; typically very affordable for tumbled stones like this one
Special Characteristics
Displays natural color zoning and internal phantom or cloud-like inclusions characteristic of macrocrystalline quartz varieties
Lore & History
Historically used in ancient jewelry and amulets by Greeks and Romans who believed it prevented intoxication; in modern metaphysical practices, it is associated with the Third Eye and Crown chakras, symbolizing spiritual growth, calmness, and protection