mineral

Pale blue-gray quartz-rich pebble (tentative)

Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment

AI-generated identification · may be incorrect

Mohs hardness about 7 if quartz-rich; pale blue-gray, opaque to translucent, with a dull to weakly vitreous luster and no obvious cleavage. The rounded, irregular form indicates natural abrasion or tumbling.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Likely weathered from a quartz vein, metamorphic rock, or silicified volcanic material and transported by water; its geological age cannot be determined from the photograph.

Uses & applications

Primarily a curiosity or lapidary specimen; quartz-rich material may be polished, tumbled, or used decoratively, but this piece has little commercial value.

Geological facts

The blue-gray color may result from microscopic inclusions, alteration, or surface coating; color alone cannot reliably identify the mineral.

Field identification & locations

Commonly found in stream gravels and weathered rock deposits. Test cautiously with a steel file or glass—quartz should scratch glass, though coatings or softer inclusions can mislead; acid testing is generally unhelpful.