mineral

Tumbled milky quartz (likely quartzite or quartz pebble)

Quartz, silicon dioxide (SiO₂); exact rock type is uncertain from the image

AI-generated identification · may be incorrect

White to translucent gray, waxy-to-glassy luster, rounded from tumbling, with no obvious cleavage and indistinct fracture; Mohs hardness 7, specific gravity about 2.65. The cloudy appearance comes from microscopic fluid inclusions or defects.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed in silica-rich veins or igneous/metamorphic rocks and was later weathered into a pebble; commercial tumbling produced the smooth surface. Quartz is geologically common from Precambrian to modern deposits.

Uses & applications

Used for ornaments, lapidary pieces, inexpensive jewelry, countertops, glass, ceramics, and electronics-grade silica. This example is primarily a decorative tumbled stone.

Geological facts

Quartz is one of Earth’s most abundant minerals and forms six-sided crystals when unconstrained. It should scratch ordinary glass, though a polished surface may make testing difficult.

Field identification & locations

Common worldwide in river gravels, quartz veins, and beach deposits; identify by hardness, lack of cleavage, translucent white color, and conchoidal fracture. A definitive distinction from quartzite requires texture examination or testing.