mineral

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, typically massive rather than visibly crystalline, with conchoidal fracture and no cleavage. The rounded shape indicates water abrasion; small dark specks may be inclusions or surface debris.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in igneous or metamorphic rocks, commonly as veins or crystals; later weathered and transported into gravel or stream deposits. Quartz is geologically ancient and occurs throughout Earth’s crust.

Uses & applications

Used for glass, ceramics, abrasives, engineered stone, and electronics; attractive translucent pieces are collected but this small pebble has minimal commercial value.

Geological facts

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

Field identification & locations

Common worldwide, especially in river gravels, quartz veins, granite terrains, and beaches. A steel file should not scratch it, whereas quartz can scratch ordinary glass; acid does not react.