Clear Quartz (Druzy)
Quartz var. Rock Crystal · Mineral Specimen / Semi-Precious Gemstone
Crystal System
Trigonal crystal system; typically displays a druzy or micro-crystalline habit in this specimen
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 (Silicon Dioxide)
Formation Process
Hydrothermal; precipitates from silica-rich fluids in rock cavities at low to moderate temperatures
About This Crystal
The specimen exhibits a 'druzy' coating of tiny, sparkling clear crystals over a darker host rock. It is translucent to transparent with a vitreous (glassy) luster and a sugary texture.
Physical Characteristics
Color: Colorless/White; Streak: White; Cleavage: None; Fracture: Conchoidal (macroscopic); Specific Gravity: 2.65; Fluorescence: Usually none; Tenacity: Brittle
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: 0.009 (uniaxial positive); No pleochroism; High vitreous luster provides the 'sparkle' effect
Hardness & Durability
Origin Region
Global; notably Brazil, Arkansas (USA), and Madagascar; formed in hydrothermal veins and geode cavities
Hardness & Durability
Mohs Hardness: 7; Very durable for jewelry; resistance to scratching is high, though the druzy points can be prone to chipping if struck
Care & Maintenance
Safe to clean with warm soapy water and soft brush; avoid ultrasonic cleaners if the host rock is porous; generally stable in sunlight
Rarity & Value
Common; Value is determined by the uniformity of the crystal coating and 'sparkle' factor; druzy quartz is affordable and popular in artisan jewelry
Special Characteristics
Druzy effect (scintillation from many tiny crystal faces); can occasionally show internal 'phantom' growth or tiny fluid inclusions
Lore & History
Historically known as 'frozen light' or 'ice of the gods' by ancient Greeks. In metaphysical traditions, it is considered a 'Master Healer' stone used for amplifying energy and clarity.