Clear Quartz
Quartz (Alpha Quartz) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; typical habit is hexagonal prisms with pyramidal terminations (tumbled in image)
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2
Formation Process
Primarily Hydrothermal (crystallizing from silica-rich fluids in veins) but also Igneous and Metamorphic
About This Crystal
A colorless, transparent to translucent tumbled stone with a vitreous luster. Features internal fractures and 'veils' or wispy inclusions characteristic of natural quartz.
Physical Characteristics
Color: Colorless; Streak: White; Cleavage: Indistinct; Fracture: Conchoidal; Specific Gravity: 2.65; Fluorescence: Usually inert
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: 0.009 (Uniaxial positive); No pleochroism
Hardness & Durability
Origin Region
Brazil, Madagascar, USA (Arkansas), and Alpine regions; found in diverse geological environments worldwide
Hardness & Durability
Mohs Hardness: 7; Toughness: Good; Highly stable and durable for all jewelry types
Care & Maintenance
Wash with warm soapy water; safe for ultrasonic cleaners; resistant to most chemicals except hydrofluoric acid
Rarity & Value
Common; value depends on clarity and size; generally inexpensive for small tumbled stones like the one shown
Special Characteristics
Displays piezoelectric and pyroelectric properties; this specimen contains internal 'veils' which are liquid/gas inclusions
Lore & History
Historically used for tools and religious objects; in lore, it is known as the 'Master Healer' associated with the Crown Chakra