mineral

Milky quartz pebble

Quartz (SiO₂), commonly called milky quartz

AI-generated identification · may be incorrect

White to translucent, glassy-to-waxy luster, no obvious cleavage, conchoidal fracture; Mohs hardness 7 and specific gravity about 2.65. The rounded shape indicates natural water abrasion or tumbling; surface staining and lighting may obscure crystal texture.

Identified August 12, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids crystallize in veins, pegmatites, and cavities, with microscopic inclusions causing the milky appearance. Quartz is geologically widespread and occurs in rocks of many ages.

Uses & applications

Commonly used as aggregate, in glass and ceramics, abrasives, and silicon production; attractive pieces are used for inexpensive carvings, cabochons, and mineral collections. This small rounded specimen typically has little commercial value.

Geological facts

Milky quartz owes its opacity to microscopic fluid inclusions, fractures, or defects rather than a different chemical composition. It can scratch ordinary glass and steel, but testing should be done only on an inconspicuous area.

Field identification & locations

The photograph is most consistent with quartz, though white chalcedony or calcite are alternatives. Near 35.9°N, 74.4°E, quartz-bearing veins and stream gravels are geologically plausible; confirm with a glass-scratch test and a lack of reaction to dilute vinegar (calcite fizzes).