mineral

Likely milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Pale cream-white, translucent with a vitreous to dull luster; quartz has Mohs hardness 7, a trigonal crystal structure, and no cleavage, breaking with irregular or conchoidal surfaces. The pictured piece is rounded and weathered, so its original crystal form is not visible.

Identified October 13, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich fluids in veins and igneous or metamorphic rocks, then becomes rounded through weathering and transport. Quartz is geologically widespread and occurs in rocks of many ages.

Uses & applications

Quartz is used in glassmaking, electronics, abrasives, and decorative objects; this small pebble is mainly suitable for collecting or crafts.

Geological facts

Quartz is one of Earth’s most abundant minerals and is notably resistant to weathering, allowing it to persist in river and beach gravels.

Field identification & locations

Look for hardness near 7, glassy translucence, and absence of cleavage; a steel knife should not readily scratch it. Quartz pebbles occur worldwide in gravels and rocky outcrops.