sedimentary

Likely weathered sandstone or iron-stained quartzite

Quartz-rich sandstone; possibly metamorphosed to quartzite (SiO₂-dominant)

AI-generated identification · may be incorrect

Brown to reddish-brown, dull to slightly sugary luster, massive and rounded, with possible fine quartz grains; quartz hardness is 7 Mohs, while sandstone varies about 6–7. No obvious cleavage; iron-oxide staining likely causes the color.

Identified September 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Most likely a river-worn or weathered quartz-rich sedimentary clast, cemented by silica or iron oxides; if quartzite, it formed by burial metamorphism of sandstone. The image alone cannot establish geological age.

Uses & applications

Common sandstone is used for building stone, paving, and aggregate; quartzite is used for durable countertops, tiles, roads, and decorative stone. This nondescript specimen has little jewelry value.

Geological facts

Its rounded shape indicates transport by water or abrasion. A glass-scratch test can help distinguish quartz-rich material, though it may damage the specimen.

Field identification & locations

Look for visible sand grains and layered texture in sandstone; interlocking sugary quartz grains and very high hardness suggest quartzite. Common worldwide, especially in river gravels and quartz-rich sedimentary terrains.