mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: White to off-white/cream; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: White to off-white/cream
Luster: Vitreous to greasy

Identified March 22, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 7 on Mohs scale; Color: White to off-white/cream; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal solutions or cooling magma. This variety gets its white color from microscopic inclusions of liquid or gas trapped during crystal growth. Can be found in geological formations ranging from Precambrian to Cenozoic.

Uses & applications

Used as an abrasive in sandblasting, in the manufacturing of glass and ceramics, as a source for silicon in electronics, and in landscaping or jewelry as tumbled stones.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. Historically, it was used by many indigenous cultures to create sharp tools and projectile points due to its conchoidal fracture pattern.

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage. It is found globally in igneous, metamorphic, and sedimentary environments, often occurring in massive veins or as river pebbles. Collectors look for pieces with iron staining (gold/red tints) or associated crystals.