Clear Quartz
Quartz var. Clear Quartz (Rock Crystal) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal, shaped into a faceted cut pendulum habit
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2
Formation Process
Hydrothermal veins and pegmatites, crystallizing from silica-rich aqueous solutions at varying temperatures and pressures
About This Crystal
Transparent, colorless crystal cut and polished into a faceted conical pendulum shape with a vitreous luster, hanging from a metal chain
Physical Characteristics
Colorless body color, white streak, conchoidal fracture, no distinct cleavage, specific gravity around 2.65, brittle tenacity, highly transparent
Optical Properties
Singly and doubly refractive with a low birefringence of 0.009, refractive index of 1.544-1.553, uniaxial positive
Hardness & Durability
Origin Region
Worldwide, notable sources include Brazil, Madagascar, USA, and the Alps
Hardness & Durability
Mohs hardness of 7, good durability, resistant to scratching by most common materials except harder minerals like topaz or corundum
Care & Maintenance
Safe to clean with warm soapy water, store separately to prevent scratching softer stones, avoid harsh hydrofluoric acid
Rarity & Value
Very common and widely available, generally inexpensive unless featuring unique inclusions or provenance
Special Characteristics
Exhibits piezoelectric and pyroelectric properties, highly transparent with minimal inclusions in this faceted form
Lore & History
Known historically as 'rock crystal' by ancient Greeks and Romans who believed it was permanently frozen ice; widely used in modern crystal healing as a master healer stone associated with the Crown Chakra