mineral

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Likely a rounded, naturally colored or tumbled quartz pebble: hardness 7 Mohs, white to cream with yellow-orange iron staining, vitreous-to-waxy luster, and a trigonal crystal structure. Quartz has no cleavage and typically breaks with a conchoidal fracture.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous and metamorphic rocks and in mineral-filled veins; this pebble may have been naturally water-worn or mechanically tumbled. Quartz occurs from ancient to recent geological settings.

Uses & applications

Quartz is used in glassmaking, electronics, abrasives, and jewelry; attractive polished pebbles are collected or used decoratively.

Geological facts

Quartz is one of Earth’s most abundant minerals. Yellow or orange patches commonly result from iron-oxide staining rather than a separate quartz variety.

Field identification & locations

Look for high hardness, glassy luster on fresh surfaces, and lack of cleavage; a steel knife should not readily scratch it. Quartz is widespread worldwide, but the image alone cannot establish the exact source or confirm the staining mineral.