Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone
Crystal System
Trigonal (Hexagonal); typically occurs in prismatic or druzy habits, though this specimen is artificially cut and polished into a double-point wand shape.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (Silicon Dioxide) with trace amounts of iron (Fe3+)
Formation Process
Hydrothermal formation at low to moderate temperatures in cavities of volcanic rocks (geodes) or within igneous pegmatites.
About This Crystal
Deep purple to violet coloration with visible color zoning. The specimen is translucent to transparent with a vitreous (glass-like) luster. It has been shaped into a polished hexagonal pillar with a pointed termination.
Physical Characteristics
Color: Violet to dark purple; Streak: White; Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.65; Fluorescence: Usually inert but can show weak greenish-blue under UV.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: 0.009 (Uniaxial positive); Weak pleochroism between purple and reddish-purple.
Hardness & Durability
Origin Region
Major sources include Brazil, Uruguay, Madagascar, and Zambia. Commonly found in volcanic geodes and pegmatites.
Hardness & Durability
Mohs Hardness: 7; Good toughness with no cleavage, making it highly durable for all types of jewelry.
Care & Maintenance
Avoid prolonged exposure to direct sunlight as colors may fade. Clean with warm soapy water; safe for ultrasonic cleaning unless heavily included.
Rarity & Value
Common to Uncommon (High-quality dark purple material is more prized). Value is determined by color saturation and clarity. Heat treatment is common to produce Citrine.
Special Characteristics
Displays distinct color zoning; iron impurities and natural radiation from surrounding rocks create the signature purple hue.
Lore & History
Ancient Greeks believed it prevented intoxication (the name comes from 'amethystos', meaning 'not drunk'). Historically associated with the Crown Chakra and considered a stone of protection and spiritual clarity.