Clear Quartz
Quartz var. Rock Crystal · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal, appearing as a tumbled, rounded pebble with no original crystal faces visible
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2
Formation Process
Hydrothermal and pegmatitic crystallization from silica-rich aqueous solutions at varying temperatures and pressures
About This Crystal
A small, transparent, tumbled gemstone with a smooth, polished, rounded surface showing a vitreous luster and a clear to slightly milky interior with minimal visible inclusions
Physical Characteristics
Colorless body color, white streak, no cleavage, conchoidal fracture, specific gravity around 2.65, brittle tenacity, and piezoelectric properties
Optical Properties
Singly refractive or uniaxial positive with a refractive index of approximately 1.544 to 1.553 and low birefringence
Hardness & Durability
Origin Region
Worldwide distribution, with major commercial sources including Brazil, Madagascar, the United States, and the Himalayan regions
Hardness & Durability
Mohs hardness of 7, good toughness, high chemical and thermal stability, highly suitable for everyday jewelry wear
Care & Maintenance
Safe to clean with warm soapy water and a soft brush; avoid harsh hydrofluoric acid; safe from normal sunlight fading
Rarity & Value
Very common worldwide, with low to moderate value depending on clarity, size, and cut, and generally untreated
Special Characteristics
Displays notable piezoelectric and pyroelectric properties under mechanical stress or temperature changes
Lore & History
Historically revered across ancient cultures as a powerful healing and amplifying stone, often associated with the Crown Chakra in modern crystal lore