Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal, with a microcrystalline or macrocrystalline habit depending on formation, often found as tumbled stones or prismatic crystals.
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2
Formation Process
Hydrothermal and magmatic processes, forming in cavities within volcanic rocks at low to moderate temperatures.
About This Crystal
A smooth, tumbled purple quartz gemstone displaying translucent to semi-translucent properties with a vitreous luster.
Physical Characteristics
Color ranges from pale lilac to deep purple; white streak; distinct conchoidal fracture; no cleavage; specific gravity of approximately 2.65.
Optical Properties
Uniaxial positive optical character with a refractive index of 1.544 to 1.553 and weak birefringence.
Hardness & Durability
Origin Region
Found globally with notable sources in Brazil, Uruguay, Madagascar, and Zambia. Typically forms in volcanic cavities or hydrothermal veins.
Hardness & Durability
Mohs hardness of 7, making it durable enough for everyday jewelry use with proper care.
Care & Maintenance
Clean with warm soapy water; avoid prolonged exposure to direct sunlight to prevent color fading.
Rarity & Value
Common to moderately rare depending on saturation; value is based on deep purple color saturation and clarity; widely accessible.
Special Characteristics
Can exhibit color zoning and occasional phantom inclusions, along with piezoelectric properties.
Lore & History
Historically used by ancient Greeks and Romans as an amulet against intoxication and to clear the mind. Associated traditionally with the third eye and crown chakras in modern crystal healing lore.