mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Hardness: 7 on Mohs scale
Color: Cloudy white to opaque
Luster: Vitreous (glassy) to greasy

Identified June 1, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Cloudy white to opaque; Luster: Vitreous (glassy) 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 as a primary constituent in igneous rocks like granite. Its cloudy appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, construction aggregate, and as decorative landscape stone or semi-precious gemstones.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is specifically clouded by microscopic bubbles of water or CO2 that were present when the crystal formed millions of years ago.

Field identification & locations

Identify by its ability to scratch glass, lack of cleavage, and white cloudy appearance. It is found globally in mountainous regions, riverbeds, and as garden stones.