Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal; typically hexongonal prismatic crystals terminating in rhombohedral faces. Form in this image is a polished 'double terminated' wand shape.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (+ Fe3+ trace elements and natural irradiation)
Formation Process
Hydrothermal; forms from silica-rich solutions at low to moderate temperatures, often in volcanic rock cavities (geodes) or pegmatites.
About This Crystal
Deep violet to pale lavender purple. This specific specimen is a polished wand showing dark purple saturation with internal fractures and color zoning. Luster is vitreous (glass-like).
Physical Characteristics
Color: Violet/Purple; Streak: White; Cleavage: None/Indistinct; Fracture: Conchoidal; Specific Gravity: 2.65; Fluorescence: Generally inert, occasionally faint blue/green.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009; Pleochroism: Weak (purple to reddish-purple); Doubly refractive (uniaxial positive).
Hardness & Durability
Origin Region
Brazil, Uruguay, Madagascar, Zambia, and South Korea; typically forms in basaltic Geodes or hydrothermal veins.
Hardness & Durability
Mohs Hardness: 7; Toughness: Fair to Good; Stable under normal wearing conditions, but sensitive to extreme heat.
Care & Maintenance
Clean with warm soapy water. Avoid ultrasonic cleaners or steam. Avoid prolonged exposure to direct sunlight as it may cause color fading. Store separately from harder gems like Topaz or Diamonds.
Rarity & Value
Common; Value is determined by color depth (deep purple with reddish flashes is most prized), clarity, and size. Heat treatment of low-grade amethyst often produces Citrine.
Special Characteristics
Color zoning (uneven distribution of purple), tiger stripe inclusions, and occasional phantom growth layers.
Lore & History
Historically used by Ancient Greeks to prevent intoxication (from the word 'amethystos', meaning not drunk). Symbolizes royalty, peace, and spiritual protection. Traditionally associated with the Third Eye and Crown Chakras.