mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, milky, or cloudy; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, milky, or cloudy
Luster: Vitreous to greasy

Identified July 16, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, milky, or cloudy; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed in hydrothermal veins, pegmatites, and as a primary constituent of igneous rocks like granite. Its milkiness is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in the production of glass, ceramics, and electronics (as a source of silica). Also common in construction aggregates, landscaping, and as decorative gravel.

Geological facts

Quartz is one of the most abundant minerals in Earth's crust. Milky quartz is the most common variety of crystalline quartz found in nature. It is extremely resistant to chemical weathering.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), its white clouded appearance, and lack of cleavage. Often found in riverbeds or near vein deposits. It is a key indicator mineral for gold in some geological environments.