sedimentary

Quartz-rich sandstone or quartzite fragment

Quartz sandstone; possibly weakly metamorphosed quartzite (SiO₂-dominant)

AI-generated identification · may be incorrect

Tan to reddish-brown, granular and nonmetallic with visible sand-sized grains; quartz has Mohs hardness 7, whereas sandstone commonly scratches around 6–7 depending on cement. No clear crystal faces or cleavage are visible.

Identified August 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely lithified quartz-rich sand cemented by silica or iron oxides; if the grains are tightly fused, it may have undergone metamorphism into quartzite. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used as building stone, aggregate, paving material, and decorative stone; attractive pieces may be collected but are generally not gemstone-grade.

Geological facts

The reddish coloration commonly comes from iron-oxide coatings such as hematite. Quartzite breaks through grains, while sandstone typically breaks around grains and feels more visibly gritty.

Field identification & locations

Look for sand grains, gritty texture, quartz-rich composition, and a white-to-reddish streak; a glass-scratch test can support quartz content, though it may damage the specimen. Common worldwide, especially in ancient sedimentary basins and metamorphic belts.