Milky Quartz
Quartz (var. Milky Quartz) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; typically hexongonal prismatic habit when crystalline, but this specimen appears as a massive, tumbled/polished bead.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (Silicon Dioxide)
Formation Process
Primarily Hydrothermal or Igneous; forms when silica-rich fluids cool or when magma crystallizes. Presence of microscopic fluid inclusions creates the white opacity.
About This Crystal
A translucent to opaque white variety of quartz. This specimen is a small, rounded bead with a waxy to vitreous luster and a cloudy, 'milky' internal appearance.
Physical Characteristics
Color: White to pale grey; Streak: White; Luster: Vitreous to waxy; Transparency: Translucent; Specific Gravity: 2.65; Fracture: Conchoidal; Streak: White.
Optical Properties
Refractive Index: 1.544-1.553; Double Refraction: Uniaxial (+); Birefringence: 0.009. Shows no pleochroism.
Hardness & Durability
Origin Region
Found globally; notable sources include Brazil, USA, Madagascar, and the Alps. Occurs in hydrothermal veins and pegmatites.
Hardness & Durability
Mohs Hardness: 7; Toughness: Good (lacks cleavage); Stability: High (resistant to most chemicals except Hydrofluoric acid). Suitable for all jewelry types.
Care & Maintenance
Safe to clean with warm soapy water, ultrasonic cleaners, and steam. Generally stable under light but should be stored separately to avoid scratching softer stones.
Rarity & Value
Common; very low price range. Value is based on cut and size rather than rarity. Rarely treated as the color is natural.
Special Characteristics
Opacity caused by minute fluid inclusions (gas or liquid) trapped during crystal growth. Can occasionally show a faint 'girasol' effect (soft glow).
Lore & History
Historically used for decorative items and tools. In traditional beliefs, it is associated with the Crown Chakra and thought to represent clarity, purity, and a 'gentle' energy compared to Rock Crystal.