Milky Quartz (Tumbled)
Quartz var. Milky Quartz · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; massive/tumbled habit
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2
Formation Process
Hydrothermal or Igneous; slow cooling allows for crystal growth, while gas/liquid inclusions create the cloudy appearance.
About This Crystal
Small, tumbled pebble with a cloudy, white to pale cream color. It exhibits a waxy to vitreous luster, is translucent to opaque, and shows smooth, rounded surfaces from mechanical polishing.
Physical Characteristics
White body color, white streak, no cleavage, conchoidal fracture (hidden by tumbling), specific gravity 2.65, non-fluorescent.
Optical Properties
Uniaxial positive, refractive index 1.544-1.553, low birefringence, lack of pleochroism.
Hardness & Durability
Origin Region
Worldwide; notably Brazil, USA, and Madagascar; occurs in hydrothermal veins and pegmatites.
Hardness & Durability
Mohs hardness 7; high toughness; very stable and excellent for all types of jewelry.
Care & Maintenance
Clean with warm soapy water; safe for ultrasonic and steam cleaning; resistant to most chemicals except hydrofluoric acid.
Rarity & Value
Very common; low price range ($1-$5 for small tumbled stones); rarely treated though sometimes dyed.
Special Characteristics
Characterized by microscopic fluid inclusions of gas or liquid that scatter light, creating the 'milky' look.
Lore & History
Historically used for carvings and tools; in modern lore, it is associated with clarity, calm, and the Crown Chakra.