Clear Quartz (Rock Crystal)
Quartz (alpha-quartz) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; typically hexangonal prisms in natural states, though here appearing as irregularly tumbled chips.
Mineral Group
Silicates (Tectosilicate group)
Chemical Formula
SiO2 (Silicon Dioxide)
Formation Process
Magmatic crystallization in pegmatites or hydrothermal precipitation in vein systems at various temperatures and pressures.
About This Crystal
Transparent to colorless tumbled chips with a vitreous (glass-like) luster. These specimens show high clarity with minimal internal fracturing.
Physical Characteristics
Color: Colorless; Streak: White; Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.65; Tenacity: Brittle; Fluorescence: Generally inert.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: 0.009 (Uniaxial positive); No pleochroism; Doubly refractive.
Hardness & Durability
Origin Region
Mainly Brazil, Madagascar, and the United States (Arkansas); found in pegmatites and hydrothermal veins.
Hardness & Durability
Mohs Hardness: 7; Toughness: Good; Highly stable against chemicals and sunlight; excellent for all jewelry types.
Care & Maintenance
Clean with warm soapy water or ultrasonic cleaners; safe from light fading; store separately to avoid scratching softer materials.
Rarity & Value
Common; very affordable in tumbled chip form. Value increases with size, perfect clarity, and absence of inclusions.
Special Characteristics
Contains piezoelectric and pyroelectric properties; this specific specimen features high transparency and conchoidal fractures.
Lore & History
Known historically as 'frozen light' or 'solidified ice' by Ancient Greeks. In metaphysical lore, it is referred to as the 'Master Healer' and associated with the Crown Chakra.