sedimentary

Weathered quartz-rich sandstone

Quartz arenite (likely feldspathic sandstone)

AI-generated identification · may be incorrect

Hardness about 6–7 for quartz grains; pale tan, rough, granular texture, and dull to slightly vitreous luster. Composed mainly of interlocking or cemented quartz grains with possible feldspar, mica, and iron-oxide staining; bedding is not clearly visible.

Identified September 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented by silica or carbonate during burial; its precise geological age cannot be determined from the image. Surface weathering has produced the irregular, crumbly appearance.

Uses & applications

Used as building stone, aggregate, paving, and silica source when sufficiently pure; this loose specimen has little commercial or jewelry value.

Geological facts

Quartz-rich sandstone commonly resists weathering better than feldspar-rich varieties, leaving grainy, protruding surfaces. Acid fizz would suggest carbonate cement rather than a purely siliceous cement.

Field identification & locations

Common worldwide in former beaches, deserts, river channels, and sedimentary basins; likely sandstone if individual sand grains are visible and the specimen scratches glass. A hand lens, streak test, and dilute hydrochloric-acid test help distinguish quartz arenite from limestone or altered rock.