Clear Quartz
Quartz var. Rock Crystal · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal (Hexagonal scalenohedral), typically prismatic or massive habit
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2
Formation Process
Primary crystallization from silica-rich hydrothermal fluids at moderate to high temperatures; also found in pegmatites
About This Crystal
Transparent, colorless variety of Quartz with a vitreous luster. This specimen is carved into a heart shape, showing exceptional clarity with minor internal veils.
Physical Characteristics
Color: Colorless; Streak: White; Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.65; Fluorescence: Usually inert; Piezoelectric and pyroelectric properties.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: 0.009 (Uniaxial positive); Pleochroism: None; Dispersion: 0.013; Singly refractive in theory but displays double refraction due to trigonal structure.
Hardness & Durability
Origin Region
Global distribution; notable sources include Minas Gerais (Brazil), Madagascar, and Arkansas (USA) in hydrothermal veins
Hardness & Durability
Mohs Hardness: 7; Toughness: Good (no cleavage); Stable under normal light and chemicals but sensitive to thermal shock.
Care & Maintenance
Clean with warm soapy water and a soft brush; safe for ultrasonic cleaning unless heavily fractured; keep away from extreme heat sources.
Rarity & Value
Abundant and common; value is determined by clarity, size, and the quality of the lapidary work (carving); generally affordable ranging from $5 to $100 depending on size.
Special Characteristics
Exhibits piezoelectricity; this specific piece features a heart-shaped lapidary cut with minor internal phantom-like veils or fractures.
Lore & History
Known as the 'Master Healer' in traditional lore; used by ancient Greeks who believed it was 'krystallos' (permanent ice); associated with the Crown Chakra and amplification of energy.