mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Identified June 10, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal solutions in veins or during the cooling of igneous pegmatites. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, electronics (as oscillators due to piezoelectric properties), and as decorative stone or landscaping material.

Geological facts

Quartz is one of the most abundant minerals in Earth's crust. Milky quartz specifically gets its 'cloudy' look from microscopic fluid inclusions that scatter light.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. It is found globally in many environments, from riverbeds to mountain ranges. Look for the distinct vitreous luster and lack of flat breaking surfaces.