mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-greasy luster; Mohs hardness 7, no cleavage, conchoidal fracture, and a hexagonal crystal structure. The cloudy appearance results from microscopic fluid inclusions or fractures.

Identified August 8, 2026More mineral →

Explore Milky quartz in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids crystallize in veins and cavities, or during igneous and metamorphic processes. Quartz is widespread in rocks of many ages; the specimen appears to be a rough, massive piece rather than a well-formed crystal.

Uses & applications

Used as a source of silica for glass, ceramics, foundry materials, and engineered stone; attractive pieces are collected or used decoratively. Milky quartz generally has little jewelry value because it is opaque and lacks strong color.

Geological facts

Quartz is one of Earth’s most abundant minerals and is chemically resistant to weathering. It may show faint crystal faces or conchoidal, shell-like fracture surfaces.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, hardness sufficient to scratch ordinary glass, and white translucent body; it commonly occurs in quartz veins, granite, pegmatites, and metamorphic rocks worldwide.