Clear Quartz
Quartz var. Clear Quartz · Semi-Precious Gemstone and Mineral Specimen
Crystal System
Trigonal, typically forming prismatic crystals, massive, or tumbled/polished shapes
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2
Formation Process
Igneous, metamorphic, and hydrothermal environments, crystallizing from silica-rich fluids at varying temperatures and pressures
About This Crystal
A tumbled, transparent to translucent specimen of clear quartz held in the palm of hand, displaying a vitreous luster, smooth polished surface, and subtle internal fractures or veining.
Physical Characteristics
Color is colorless or white, streak is white, cleavage is absent, fracture is conchoidal, specific gravity is approximately 2.65, tenacity is brittle, and it exhibits piezoelectric properties.
Optical Properties
Refractive index ranges from 1.544 to 1.553, doubly refractive (uniaxial positive), with no significant pleochroism due to lack of body color.
Hardness & Durability
Origin Region
Worldwide, with notable deposits in Brazil, Madagascar, the United States, and the Himalayan region
Hardness & Durability
Mohs hardness of 7, good durability and wearability for jewelry use, though internal stress fractures can make it susceptible to heavy impacts.
Care & Maintenance
Can be cleaned safely with warm soapy water and a soft brush; avoid harsh chemicals and sudden extreme temperature changes, though generally stable in sunlight.
Rarity & Value
Common, widely accessible, with value depending on clarity, size, and cutting, ranging from inexpensive tumbled stones to higher-priced master crystals.
Special Characteristics
May exhibit piezoelectricity and pyroelectricity; can contain various mineral inclusions like rutiles or phantom growth layers in unpolished states.
Lore & History
Known historically as the 'Universal Crystal' or 'Master Healer', used across ancient cultures for clarity, energy amplification, and spiritual connection, traditionally associated with the Crown Chakra.