mineral

Tumbled milky quartz (likely quartz pebble)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to pale gray, vitreous-to-waxy luster, and massive rather than visibly crystalline structure. It has no cleavage, conchoidal fracture, and specific gravity around 2.65.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, metamorphic, and hydrothermal environments when silica crystallizes; milky appearance results from microscopic fluid inclusions or fractures. The pictured piece is likely naturally rounded or tumbled and cannot be assigned a precise geological age.

Uses & applications

Used for glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are sold as inexpensive lapidary or metaphysical specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the defining mineral of Mohs hardness 7. Its translucency commonly increases when held against strong light.

Field identification & locations

Common in quartz veins, granitic rocks, metamorphic terrains, and stream gravels worldwide. A steel file should not scratch it, while quartz or glass can scratch it; acid does not react.