mineral

Tumbled milky quartz (likely quartz pebble)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster with a smooth tumbled surface; hardness about 7 Mohs, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity near 2.65. Small dark specks may be inclusions or surface debris.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed when silica-rich fluids crystallized in veins or cavities, commonly in igneous, metamorphic, and sedimentary rocks; the specimen was later mechanically polished. Quartz ranges from Precambrian to recent in age.

Uses & applications

Used extensively in glass, electronics, abrasives, engineered stone, and jewelry; this small piece is mainly a decorative or collecting specimen.

Geological facts

Milky opacity is caused by microscopic fluid inclusions, fractures, or impurities. Quartz is one of Earth’s most abundant and durable minerals.

Field identification & locations

Common worldwide, especially in hydrothermal veins, pegmatites, and quartz-rich gravels. Confirm with a scratch test against glass—quartz should scratch it—though testing may damage the polished piece.