mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to translucent
Luster: Vitreous to greasy

Identified March 1, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Forms in hydrothermal veins, pegmatites, and igneous rocks through the cooling of silica-rich magma or precipitation from hot fluids. It can be found in rocks from virtually all geological ages.

Uses & applications

Used widely in glass making, ceramics, as an abrasive, in the electronics industry for its piezoelectric properties, and in construction as a component of concrete or road fill.

Geological facts

Milky quartz gets its white color from tiny fluid inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. It is found globally in mountainous regions and riverbeds. For collectors, look for unique inclusions or association with minerals like gold or pyrite.