Clear Quartz
Quartz · Semi-Precious Gemstone and Mineral Specimen
Crystal System
Trigonal, typically forming prismatic crystals terminated by six-sided pyramids
Mineral Group
Silicates - Tectosilicates
Chemical Formula
SiO2
Formation Process
Igneous, metamorphic, and hydrothermal processes; frequently crystallizes from silica-rich fluids at varying temperatures
About This Crystal
A tumbled, polished smooth, transparent to translucent colorless specimen with a glassy luster and subtle internal fractures
Physical Characteristics
Colorless, white streak, conchoidal fracture, completely lacking cleavage, specific gravity of approximately 2.65, brittle tenacity, and exhibits piezoelectric properties
Optical Properties
Uniaxial positive optical character, refractive index of 1.544 to 1.553, birefringence of 0.009, doubly refractive
Hardness & Durability
Origin Region
Worldwide, with significant deposits in Brazil, Madagascar, USA, and the Alps
Hardness & Durability
Mohs hardness of 7, excellent durability, highly resistant to scratching, suitable for all types of jewelry wear
Care & Maintenance
Safe to clean with warm soapy water and soft brush; can withstand ultrasonic cleaners unless heavily fractured; store separately to prevent scratching softer stones
Rarity & Value
Extremely common worldwide; inexpensive as a tumbled stone or standard mineral specimen, with value increasing for flawless optical grade or large natural crystal clusters
Special Characteristics
Displays piezoelectricity, sometimes contains fluid inclusions or subtle phantom layers, and can exhibit weak phosphorescence or thermoluminescence in certain varieties
Lore & History
Historically regarded as frozen water by ancient Greeks, used globally across ancient civilizations for talismans and divination; in modern crystal healing, it is considered the 'master healer' and is associated with all chakras