Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal, massive to tumbled pebble habit
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2
Formation Process
Hydrothermal and magmatic processes, typically forming in volcanic rock cavities or hydrothermal veins at low to moderate temperatures
About This Crystal
A tumbled, smooth purple quartz pebble showing translucent to opaque areas with subtle color zoning and lighter cloudy patches typical of tumbled quartz varieties.
Physical Characteristics
Purple body color with a white streak, conchoidal fracture, lack of distinct cleavage, vitreous to waxy luster when polished, and a specific gravity of approximately 2.65.
Optical Properties
Uniaxial positive optical character, doubly refractive with low birefringence, and generally lacking strong pleochroism in tumbled form.
Hardness & Durability
Origin Region
Brazil, Uruguay, Madagascar, and worldwide alluvial deposits
Hardness & Durability
Mohs hardness of 7, making it durable and suitable for everyday jewelry wear with good toughness and no significant cleavage.
Care & Maintenance
Clean with warm soapy water using a soft brush, avoid prolonged exposure to direct sunlight to prevent color fading, and store separately to avoid scratching softer stones.
Rarity & Value
Common to moderately rare depending on saturation and clarity; tumbled specimens are widely available and affordable, often ranging from inexpensive to moderate prices.
Special Characteristics
Piezoelectric and pyroelectric properties, occasionally showing color banding or phantom inclusions in raw forms.
Lore & History
Historically associated with royalty, sobriety, and spiritual clarity across ancient Egyptian, Greek, and Roman cultures; often linked in modern crystal healing with the third eye and crown chakras for calming and protective energy.