Clear Quartz
Quartz (crystalline) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal - Hexagonal; typically prismatic with pyramidal terminations (habit shown is a broken rough fragment)
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 (Silicon Dioxide)
Formation Process
Magmatic crystallization in pegmatites, hydrothermal veins, and metamorphic environments.
About This Crystal
Transparent to translucent colorless crystal fragment. It exhibits a vitreous (glass-like) luster and a conchoidal fracture pattern. The specimen appears roughly 3cm in length based on the ruler scale.
Physical Characteristics
Color: Colorless; Streak: White; Cleavage: None/Indistinct; Fracture: Conchoidal; Specific Gravity: 2.65; Tenacity: Brittle; Piezoelectric; Fluorescence: Generally none or very faint.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009 (uniaxial positive); Dispersion: 0.013; exhibits double refraction.
Hardness & Durability
Origin Region
Found worldwide; major sources include Brazil, Madagascar, Arkansas (USA), and the Alps.
Hardness & Durability
Mohs Hardness: 7; Toughness: Fair (brittle); Stability: Excellent, resistant to most acids except Hydrofluoric.
Care & Maintenance
Clean with warm soapy water or ultrasonic cleaners. Safe in sunlight. Keep away from harder stones like Topaz or Sapphire to avoid scratching.
Rarity & Value
Common rarity; value is generally low for rough specimens, determined by clarity and size. Minimal treatment typically applied to clear varieties.
Special Characteristics
Exhibits strong piezoelectricity (generates electric charge under mechanical stress) and features internal fractures called 'veils' or 'feathers'.
Lore & History
Known historically as 'Rock Crystal.' Used by ancient Greeks (who believed it was permanent ice) and in various cultures for lenses, jewelry, and ritual objects. Traditionally associated with the Crown Chakra and believed to be a 'master healer' in metaphysical lore.