mineral

Milky quartz (likely quartz-rich pebble)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically hardness 7 Mohs, white to translucent gray, vitreous-to-waxy luster, and a hexagonal crystal structure. It has indistinct cleavage, conchoidal fracture, and specific gravity around 2.65; the specimen appears naturally weathered and possibly iron-stained.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, or igneous rocks; its exact geological age cannot be determined from the photograph. Rounded edges suggest stream, beach, or glacial transport and abrasion.

Uses & applications

Common quartz is used in glass, ceramics, engineered stone, abrasives, electronics, and construction aggregate. Attractive translucent pieces may be collected, polished, or used as low-cost lapidary material.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is one of Earth’s most abundant and durable minerals.

Field identification & locations

Identify it by its glassy appearance, lack of prominent cleavage, conchoidal fracture, and ability to scratch ordinary steel or glass. Common worldwide, especially in quartz veins, granitic terrains, and gravels.