Clear Quartz
Quartz var. Clear Quartz (Rock Crystal) · Semi-Precious Gemstone and Mineral Specimen
Crystal System
Trigonal, typically forms as prismatic hexagonal crystals with pyramidal terminations, though this specimen is a tumbled and polished pebble.
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2
Formation Process
Primarily forms through hydrothermal solutions in cavities and veins, or as a primary component in igneous pegmatites and metamorphic rocks at varying temperatures and pressures.
About This Crystal
The specimen is a smooth, polished, tumbled stone (pocket stone) of clear quartz. It exhibits high transparency with glassy (vitreous) luster, featuring subtle internal veiling and minor veined inclusions near the center.
Physical Characteristics
Color is colorless and transparent; white streak; no cleavage; conchoidal fracture; specific gravity of approximately 2.65; brittle tenacity; exhibits piezoelectricity.
Optical Properties
Uniaxial positive with a refractive index of 1.544 to 1.553; birefringence of 0.009; doubly refractive; no notable pleochroism due to lack of body color.
Hardness & Durability
Origin Region
Found globally with major commercial sources in Brazil, Madagascar, the United States, and the Himalayan region. Forms in diverse geological environments.
Hardness & Durability
Mohs hardness of 7; good toughness with no cleavage planes, making it very durable for everyday jewelry wear and handling.
Care & Maintenance
Extremely durable and easy to care for; safe to clean with warm soapy water and soft brush; can withstand sunlight and household chemicals, though ultrasonic and steam cleaners should be used with caution if inclusions are present.
Rarity & Value
Very common and widely available worldwide; value is generally low for tumbled stones, ranging from a few dollars to tens of dollars depending on size, clarity, and polish.
Special Characteristics
Displays piezoelectric properties, generating an electrical charge under mechanical stress. May contain subtle internal phantom inclusions or fluid-filled micro-cavities.
Lore & History
Historically known as 'Krystallos' by the ancient Greeks, believing it to be permanently frozen ice. Often called the 'Master Healer' in modern crystal healing traditions and associated with all chakras, particularly the Crown chakra.