mineral

Milky quartz (rough quartz pebble)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to translucent, glassy-to-waxy luster with irregular fracture; likely Mohs hardness 7, no cleavage, hexagonal crystal structure, and specific gravity about 2.65. The rounded shape suggests natural abrasion or minor human shaping.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, or igneous rocks; the cloudy appearance results from microscopic fluid inclusions or fractures. The specimen’s exact geological age and source cannot be determined from the image.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are sold as inexpensive mineral specimens or cabochons.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, allowing it to accumulate in river gravels and beaches.

Field identification & locations

Likely identification features are hardness sufficient to scratch glass, lack of cleavage, pale translucency, and conchoidal fracture. Common worldwide, especially in quartz veins and alluvial deposits; test discreetly because scratching can damage surfaces.