Milky Quartz (Vein Quartz)
Quartz var. Milky Quartz · Mineral Specimen / Common Decorative Stone
Crystal System
Trigonal (Trapzohedral); typically occurs as massive vein filling or prismatic crystals with pyramidal terminations
Mineral Group
Silicates (Tectosilicates)
Chemical Formula
SiO2 (Silicon Dioxide) with fluid or gas inclusions
Formation Process
Hydrothermal; crystallization from silica-rich fluids in rock fissures and veins during cooling of magma or regional metamorphism.
About This Crystal
Opaque to translucent white appearance due to tiny fluid or gas bubbles trapped during crystal growth. Exhibits a greasy to vitreous luster and typically occurs in massive form within a host rock matrix.
Physical Characteristics
Color: Milky white; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.65; Fluorescence: Usually inert but can show weak yellow.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009 (Uniaxial positive); No pleochroism or dispersion; opaque quality masks most optical phenomena.
Hardness & Durability
Origin Region
Found globally; notable sources include USA (Arkansas), Brazil, and the Alps. Often occurs in metamorphic terrains or volcanic regions.
Hardness & Durability
Mohs Hardness: 7; Toughness: Medium to High; excellent stability and resistance to chemicals and environmental degradation.
Care & Maintenance
Extremely durable; safe for ultrasonic and steam cleaning; can be washed with warm soapy water and stored without special precautions.
Rarity & Value
Common; very low market value for raw specimens. Value is primarily determined by size, shape, or use in landscaping and gravel.
Special Characteristics
Can contain 'enhydro' (water inclusions) or show internal fracturing that creates rainbow-like iris effects (fire quartz).
Lore & History
Historically used for stone tools and ritual objects. In lore, it is often associated with the Crown Chakra and believed to represent clarity, purity, and universal consciousness.