mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Mohs hardness: 7; Color: Milky white to opaque; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7
Color: Milky white to opaque
Luster: Vitreous to greasy

Identified July 17, 2026More mineral →

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Physical properties

Mohs hardness: 7; Color: Milky white to opaque; 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 hydrothermal veins or magma in igneous and metamorphic environments. The white color is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glass manufacturing, electronics (piezoelectric properties), abrasives, construction aggregates, and occasionally as a gemstone or for decorative landscaping.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz found worldwide.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and characteristic waxy-to-glassy luster. Frequently found in mountain ranges, riverbeds, and as veins in larger rock bodies.