Milky Quartz
Quartz (var. Milky Quartz) · Mineral Specimen / Common Decorative Stone
Crystal System
Trigonal; typically occurs in massive, microcrystalline, or coarse granular habits.
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2
Formation Process
Primarily Magmatic or Hydrothermal; forms from silica-rich fluids cooling in cavities or veins at various temperatures.
About This Crystal
Opaque to translucent white stone with a dull to vitreous luster. The milky appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.
Physical Characteristics
Color: White to off-white; Streak: White; Fracture: Conchoidal to uneven; Specific Gravity: 2.65; Fluorescence: Usually inert.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009; Uniaxial (+); typically lacks pleochroism due to opacity.
Hardness & Durability
Origin Region
Found globally; common in Brazil, USA (Arkansas/North Carolina), and Alpine regions. Forms in pegmatites and hydrothermal veins.
Hardness & Durability
Mohs Hardness: 7; Toughness: Good (brittle but lacks cleavage); very stable for all jewelry and decorative uses.
Care & Maintenance
Safe to clean with warm soapy water, ultrasonic cleaners, or steam. Extremely durable and resistant to most household chemicals.
Rarity & Value
Very Common; low commercial value. Value is based on size and aesthetic shape rather than rarity. Rarely treated.
Special Characteristics
Characterized by its 'milky' turbidity due to fluid inclusions; can occasionally exhibit phantom growth layers or golden rutile inclusions.
Lore & History
Historically used for tools and ornaments since the Stone Age. In modern lore, it is referred to as a 'Snow Quartz' and associated with purity and calming energy (Crown Chakra).