mineral

Possible weathered quartz-rich pebble

Likely microcrystalline quartz (SiO₂), possibly quartzite or chalcedony

AI-generated identification · may be incorrect

Small, rounded, cream-gray specimen with brown iron-oxide staining and a dull to weakly waxy luster; hardness approximately 6.5–7 Mohs, no obvious cleavage, and conchoidal to irregular fracture. The image is insufficient to determine crystal structure or density reliably.

Identified September 6, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed as silica-rich rock or vein material and later rounded by stream or shoreline abrasion; iron-bearing groundwater produced the brown staining. Geological age cannot be determined visually.

Uses & applications

Suitable mainly as a teaching or curiosity specimen; quartz-rich material may be used as aggregate or ornamental stone, but this piece has no apparent gem-grade value.

Geological facts

Its high hardness should allow it to scratch ordinary glass, while a steel knife generally will not scratch it. The visible markings may reflect quartz veins, weathering, or staining rather than true banding.

Field identification & locations

Common in stream gravels and weathered quartz veins worldwide; test hardness and inspect a fresh surface with a loupe. A hardness test, streak test, and specific-gravity measurement would improve identification.