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 July 11, 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

Formed from the cooling of magma or hydrothermal solutions in veins. The white color is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth. They are found across all geological ages.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), jewelry, and as a decorative stone in landscaping and interior design.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It is often found in massive form in hydrothermal veins, frequently associated with gold deposits in 'mother lode' systems.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and white 'milky' appearance. It is found globally in mountainous regions, riverbeds, and as veins in metamorphic and igneous rocks.