Milky Quartz with Iron Oxide and Sulfide Inclusions
Quartz var. Milky Quartz · Mineral Specimen
Crystal System
Trigonal, massive to crystalline habit with irregular fracture surfaces
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2
Formation Process
Hydrothermal and magmatic processes, forming in veins or cavities from silica-rich aqueous solutions at high temperatures and pressures
About This Crystal
A rough, unpolished mineral specimen showing a white to milky quartz matrix with grayish-blue bands and distinct brownish-yellow iron oxide (limonite/goethite) staining along fractures and surfaces. The transparency ranges from translucent to opaque, with a vitreous to greasy luster on fractured faces.
Physical Characteristics
Color includes white, gray, and yellowish-brown. Streak is white. Cleavage is absent, fracture is conchoidal to uneven. Specific gravity is approximately 2.65. Tenacity is brittle. Displays piezoelectric properties under mechanical stress.
Optical Properties
Uniaxial positive optical character with a refractive index of 1.544 to 1.553 and low birefringence of 0.009. Shows no pleochroism in pure zones.
Hardness & Durability
Origin Region
Worldwide distribution; commonly found in hydrothermal veins and pegmatites
Hardness & Durability
Mohs hardness of 7. Good durability and resistance to scratching, though brittle under sharp impacts. Suitable for general handling but vulnerable to thermal shock.
Care & Maintenance
Can be safely cleaned with warm soapy water and a soft brush. Avoid harsh chemical cleaners and sudden temperature extremes.
Rarity & Value
Very common mineral globally; low monetary value as a raw specimen unless exceptionally formed or associated with precious metals like gold.
Special Characteristics
Often contains micro-inclusions of fluid or minerals like pyrite, galena, or iron oxides which create the dark banding and rusty staining visible on the specimen.
Lore & History
Historically used by ancient cultures for simple tools, amulets, and divination. In modern metaphysical practices, milky quartz is traditionally associated with emotional clarity, meditation, and soothing energy, though these are cultural beliefs rather than scientific properties.