mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and hexagonal crystal structure. The orange-brown areas are likely iron-oxide staining or attached weathered matrix.

Identified August 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in fractures, veins, or cavities, commonly during hydrothermal activity; its age depends on the host rock and may range from ancient to recent. The specimen appears naturally broken rather than polished.

Uses & applications

Used as a silica source in glass, ceramics, foundry sand, and electronics; attractive transparent pieces are collected, while colorful varieties may be used ornamentally. This rough piece has little commercial value.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is among the most abundant and durable minerals in Earth’s continental crust.

Field identification & locations

Identify by its glassy appearance, hardness, lack of cleavage, and inability to scratch it with a steel knife; it should scratch ordinary glass. Common in quartz veins, pegmatites, granites, and metamorphic rocks worldwide.