mineral

Milky Quartz

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale), Color: White or cloudy, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: Indistinct/Conchoidal fracture, Specific gravity: 2.65

Identified May 6, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: White or cloudy, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: Indistinct/Conchoidal fracture, Specific gravity: 2.65

Formation & geological history

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

Uses & applications

Used as an abrasive in industry, in the production of glass and ceramics, as a source for silicon, and in landscaping or as low-cost decorative specimens.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It can sometimes contain trace amounts of gold within veins, making it a target for prospectors.

Field identification & locations

Identify in the field by its white color, hardness (it will scratch glass), and lack of cleavage (it breaks in irregular, shell-like curves). Commonly found in mountain regions and riverbeds globally.