Clear Quartz
Quartz (Alpha Quartz) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal (Hexagonal-R), typically hexagonal prismatic habit with pyramid-shaped terminations
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2
Formation Process
Primarily Magmatic or Hydrothermal; crystallizes from silica-rich fluids in cools igneous rocks or hydrothermal veins
About This Crystal
Colorless, transparent to translucent stone with a vitreous (glass-like) luster. This specimen appears as a rough, chunky fragment with typical uneven surface texture.
Physical Characteristics
Color: Colorless; Streak: White; Cleavage: None (poor); Fracture: Conchoidal; Specific Gravity: 2.65; Fluorescence: Usually none/inert.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: 0.009 (Uniaxial positive); Dispersion: 0.013; No pleochroism.
Hardness & Durability
Origin Region
Brazil, Madagascar, Arkansas (USA), Alps (Europe); found in pegmatites and hydrothermal veins
Hardness & Durability
Mohs Hardness: 7; Toughness: Good; Stability: High (resistant to most acids except Hydrofluoric; stable under normal light and heat).
Care & Maintenance
Clean with warm soapy water and a soft brush; ultrasonic cleaners are generally safe if no liquid inclusions are present; store away from harder stones like Topaz or Corundum.
Rarity & Value
Very Common; Value is determined by clarity and size; generally inexpensive ($1-$20 for small raw specimens), though large optical-grade clusters can be pricey.
Special Characteristics
Piezoelectric and pyroelectric properties; may contain 'phantom' growth layers or internal fractures showing rainbow interference colors.
Lore & History
Historically known as 'rock crystal' from the Greek 'krystallos' (ice). Used by ancient civilizations for tools and talismans. In modern lore, it is considered a 'Master Healer' associated with the Crown Chakra.