Clear Quartz
Quartz (a-Silicon Dioxide) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; typically hexongal prismatic in raw state, but displayed here as a polished sphere.
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 (Silicon Dioxide)
Formation Process
Magmatic/Hydrothermal; forms in pegmatites, hydrothermal veins, and geodes from silica-rich fluids.
About This Crystal
A polished sphere of colorless, transparent to translucent quartz. It exhibits a vitreous luster and contains internal veils, fractures, and 'crazing' patterns which create light reflections.
Physical Characteristics
Color: Colorless; Streak: White; Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.65; Fluorescence: Usually inert.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009 (uniaxial positive); Dispersion: 0.013; exhibits double refraction.
Hardness & Durability
Origin Region
Found globally; major sources include Minas Gerais, Brazil; Arkansas, USA; and Madagascar.
Hardness & Durability
Mohs Hardness: 7; High durability and stability for jewelry and decor; brittle tenacity; no cleavage issues.
Care & Maintenance
Clean with warm soapy water and a soft brush; safe for ultrasonic cleaners unless heavily fractured; store separately from diamonds.
Rarity & Value
Common; generally affordable. Value is determined by clarity, size, and the quality of the sphere's polish.
Special Characteristics
Piezoelectric and pyroelectric properties; this specimen shows internal 'rainbow' reflections due to interference in fractures.
Lore & History
Known historically as 'Rock Crystal.' Ancient Greeks believed it was permanent ice. Traditionally associated with clarity and the Crown Chakra.