mineral

Tumbled pale quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 7, vitreous to pearly luster, white to translucent coloration, and a hexagonal crystal structure; quartz has indistinct cleavage and conchoidal fracture. The rounded shape indicates tumbling or polishing.

Identified August 7, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, metamorphic, and hydrothermal environments across many geological ages. Its cloudy appearance results from microscopic fluid inclusions, fractures, or mineral impurities.

Uses & applications

Used as a low-cost decorative, craft, and metaphysical stone; quartz varieties are also important in glassmaking, electronics, abrasives, and ceramics. This specimen is generally a tumbled ornamental piece.

Geological facts

It may resemble calcite, which is softer and effervesces in dilute acid, but quartz will scratch glass and resist a steel knife. Exact identification is limited by the photograph.

Field identification & locations

Common worldwide, including Brazil, Madagascar, the United States, and many alluvial deposits. Test cautiously with a scratch comparison: quartz should scratch ordinary glass, though polished surfaces may be difficult to test without damage.