Milky Quartz
Quartz var. Milky Quartz · Mineral Specimen and Semi-Precious Gemstone
Crystal System
Trigonal, with a typical prismatic crystal habit capped by rhombohedral faces.
Mineral Group
Silicates (Subgroup: Tectosilicate)
Chemical Formula
SiO2
Formation Process
Hydrothermal and magmatic processes, precipitating from silica-rich aqueous solutions at varying temperatures and pressures within rock cavities.
About This Crystal
A tumbled or polished prismatic crystal point showing a milky white, cloudy appearance due to microscopic fluid and gas inclusions trapped during growth. It is translucent to opaque with a vitreous to greasy luster.
Physical Characteristics
Color is milky white to translucent white with a white streak. It exhibits no true cleavage, breaking with a distinct conchoidal fracture. Specific gravity is approximately 2.65. It is brittle and displays piezoelectric properties.
Optical Properties
Uniaxial positive with a refractive index of 1.544 to 1.553. Birefringence is 0.009. It is doubly refractive and generally non-pleochroic due to its white body color.
Hardness & Durability
Origin Region
Found worldwide, with notable deposits in Brazil, Madagascar, the United States, and the Alps. Typically forms in hydrothermal veins and pegmatites.
Hardness & Durability
Mohs hardness of 7. It has good durability and toughness, making it suitable for general jewelry use, though the lack of cleavage reduces major breakage risks.
Care & Maintenance
Easily cleaned with warm soapy water and a soft brush. Avoid harsh chemical cleaners and sudden extreme temperature changes, though it is generally stable in light.
Rarity & Value
Very common and widely accessible. Value is very low for typical polished specimens, ranging from a few dollars upwards depending on size and craftsmanship.
Special Characteristics
Often contains microscopic liquid or gas inclusions that cause the milky white turbidity. Can exhibit weak phosphorescence or triboluminescence in rare instances.
Lore & History
Historically used in various cultures for amulets and tools. In modern metaphysical practices, milky quartz is associated with clarity, emotional healing, and the crown chakra, though these are traditional beliefs rather than scientifically proven claims.