mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to pale grey; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Cloudy white to pale grey
Luster: Vitreous to greasy

Identified April 8, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Cloudy white to pale grey; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. The milky appearance is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth. Can be found in rocks of varying ages from Precambrian to recent.

Uses & applications

Used in glassmaking, abrasives, and as a source of silicon for electronics. In polished form, it is used for tumbled stones, decorative ornaments, and metaphysical 'healing' crystals.

Geological facts

Milky quartz is the most common variety of crystalline quartz. While it lacks the clarity of rock crystal, it can contain traces of gold in hydrothermal vein deposits, making it a target for prospectors.

Field identification & locations

Identify in the field by its hardness (will scratch glass and steel), white streak, and lack of cleavage. It often appears as veins cutting through other rock types. Found globally, especially in mountain ranges and gravel beds.