Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal system; commonly occurs in hexagonal prisms terminated by rhombohedral faces; habit in this specimen is druzy/massive.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2
Formation Process
Primarily Hydrothermal; precipitates from silica-rich solutions in rock cavities and veins under a wide range of temperatures.
About This Crystal
A colorless to white translucent specimen featuring a 'druzy' surface of small, sparkling crystal terminations. It has a vitreous luster and a crystalline, granular texture.
Physical Characteristics
Color: Colorless/White; Streak: White; Cleavage: Poor/None; Fracture: Conchoidal; Specific Gravity: 2.65; Fluorescence: Generally none.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: 0.009; Optical Character: Uniaxial positive; Pleochroism: None.
Hardness & Durability
Origin Region
Worldwide; notable sources include Brazil, Arkansas (USA), and Madagascar. Forms in pegmatites and hydrothermal veins.
Hardness & Durability
Mohs Hardness: 7; Toughness: Good; Stability: Very high, though sensitive to sudden thermal shock.
Care & Maintenance
Safe to clean with warm soapy water, ultrasonic cleaners, and steam. Store away from harder gems like Topaz or Sapphire to avoid scratching.
Rarity & Value
Common; value is determined by clarity and crystal size. Druzy specimens are affordable and widely available as decor or jewelry components.
Special Characteristics
Exhibits piezoelectricity and pyroelectricity. This specimen shows a druzy habit, creating a carpet-like sparkling effect from multiple tiny crystal faces.
Lore & History
Historically known as 'ice' by ancient Greeks (krustallos). Symbolizes clarity and amplification in traditional lore; associated with the Crown Chakra.