Clear Quartz (Rock Crystal)
Quartz var. Rock Crystal · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal; usually prismatic with hexagonal cross-sections, but found as irregular tumbled chips in this specimen.
Mineral Group
Silicates; Tectosilicate subgroup
Chemical Formula
SiO2 (Silicon Dioxide)
Formation Process
Forms primarily in hydrothermal veins and pegmatites through the cooling of silica-rich solutions.
About This Crystal
Transparent, colorless crystal beads (chip style) with a vitreous luster. These specimens show high clarity with occasional internal fractures or veils.
Physical Characteristics
Color: Colorless; Streak: White; Cleavage: None (indistinct); Fracture: Conchoidal; Specific Gravity: 2.65; Fluorescence: Usually inert.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: 0.009; Uniaxial (+); no pleochroism.
Hardness & Durability
Origin Region
Globally abundant, notably Brazil, Arkansas (USA), Madagascar, and the Alps.
Hardness & Durability
Mohs Hardness: 7; Toughness: Good; very durable for daily jewelry wear.
Care & Maintenance
Clean with warm soapy water and a soft brush; safe for ultrasonic cleaning if no significant fractures are present.
Rarity & Value
Common; value for chip beads is very low, typically sold by the strand or weight.
Special Characteristics
Piezoelectric and pyroelectric properties; can contain 'phantom' inclusions or liquid-filled cavities (enhydros).
Lore & History
Historically used for hardstone carving and lenses; traditionally known as the 'Master Healer' in metaphysical practices, associated with the Crown Chakra.