Milky Quartz
Quartz (Silicon Dioxide) var. Milky Quartz · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal (Hexagonal system); Habit is usually massive or prismatic with pyramidal terminations
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2
Formation Process
Primarily Magmatic or Hydrothermal; crystallizes from silica-rich fluids in veins or geode cavities during the cooling of magma.
About This Crystal
Opaque to translucent white 'milky' appearance caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth. Exhibits a vitreous to greasy luster.
Physical Characteristics
White to cloudy colorless; White streak; No cleavage; Conchoidal fracture; Specific gravity 2.65; Occasionally fluorescent under UV.
Optical Properties
Refractive index 1.544-1.553; Uniaxial positive; Weak birefringence; No pleochroism.
Hardness & Durability
Origin Region
Found globally; notable sources include Brazil, USA (Arkansas/California), and Madagascar. Forms in pegmatites and hydrothermal veins.
Hardness & Durability
7.0 on Mohs scale; High toughness; Highly stable and resistant to most chemical weathering except hydrofluoric acid.
Care & Maintenance
Wash with warm soapy water; safe for ultrasonic and steam cleaning unless heavily fractured; Store separately to avoid scratching softer materials.
Rarity & Value
Common; Very affordable and abundant; Value is largely determined by size, purity of white color, or presence of other mineral inclusions.
Special Characteristics
The milkiness is due to 'fluid inclusions'—bubbles of water or gas trapped for millions of years; piezoelectric and pyroelectric properties.
Lore & History
Historically used in tool-making and spiritual objects across many cultures. Traditionally associated with the Crown Chakra and believed to promote clarity and concentration.