Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal, with a massive or raw crystalline habit mounted as a decorative point.
Mineral Group
Silicates (Subgroup: Tectosilicate)
Chemical Formula
SiO2
Formation Process
Hydrothermal and volcanic processes, forming in gas cavities (vesicles) within basaltic lavas from silica-rich solutions at low to moderate temperatures.
About This Crystal
A deep purple, raw crystal specimen mounted in a metallic prongs fixture, showing translucent to transparent areas with vitreous luster, natural surface fractures, and color zoning.
Physical Characteristics
Purple body color, white streak, conchoidal fracture, no true cleavage, specific gravity of approximately 2.65, brittle tenacity, and sometimes weak green or blue fluorescence under shortwave UV light.
Optical Properties
Uniaxial positive optical character, doubly refractive, weak dichroism with reddish-purple and bluish-purple shades visible from different angles.
Hardness & Durability
Origin Region
Brazil, Uruguay, Madagascar, and Zambia; typically found in volcanic rock cavities or hydrothermal veins.
Hardness & Durability
Mohs hardness of 7, fair toughness due to lack of cleavage, but susceptible to thermal shock and prolonged direct sunlight which can cause fading.
Care & Maintenance
Clean with warm soapy water using a soft brush; avoid harsh chemicals, ultrasonic cleaners, and prolonged exposure to direct sunlight to prevent color fading.
Rarity & Value
Common to moderately rare depending on saturation and clarity; valued based on deep purple color saturation, transparency, and absence of inclusions. Generally affordable.
Special Characteristics
Displays natural color zoning, typical phantom or internal fracture inclusions, and piezoelectric and pyroelectric properties.
Lore & History
Historically used by ancient Greeks and Romans to prevent intoxication, associated with royalty, peace, and spiritual growth. Frequently linked to the Third Eye and Crown chakras in modern metaphysical practices.