Milky Quartz
Quartz (Silicon Dioxide) · Mineral Specimen / Decorative Stone
Crystal System
Trigonal; commonly occurs in massive, vein-filling habits or as hexagonal prisms in vugs.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2
Formation Process
Hydrothermal; precipitates from silica-rich fluids in rock fractures and veins during cooling.
About This Crystal
A translucent to opaque white mineral embedded in a dark, fine-grained host rock. It displays a vitreous to greasy luster and irregular, grainy habit.
Physical Characteristics
White color with a white streak; no cleavage; conchoidal to uneven fracture; specific gravity 2.65; generally non-fluorescent.
Optical Properties
Uniaxial positive; refractive index 1.544-1.553; weakly pleochroic; may show slight opalescence due to fluid inclusions.
Hardness & Durability
Origin Region
Found globally; notably in hydrothermal veins within metamorphic and igneous rock formations.
Hardness & Durability
Mohs hardness of 7; high toughness; very stable against heat and chemicals with no cleavage risks.
Care & Maintenance
Safe to clean with warm soapy water; resistant to sunlight fading; durable enough for most environments.
Rarity & Value
Very common; low commercial value for raw specimens, though value increases with crystal size or clarity.
Special Characteristics
The milkiness is caused by millions of microscopic fluid inclusions (bubbles of gas or liquid) trapped during growth.
Lore & History
Historically used for tools and ornaments; traditionally associated with clarity of thought and the Crown Chakra in folk lore.