sedimentary to metamorphic

Weathered quartz-rich rock, likely sandstone or quartzite

Quartz-dominated lithic fragment; probable quartz sandstone (SiO₂)

AI-generated identification · may be incorrect

Tan-brown, fine- to medium-grained, dull to weakly sugary luster, with irregular fracture and no obvious cleavage; estimated Mohs hardness 6–7. Surface iron staining and weathering obscure the texture.

Identified August 17, 2026More sedimentary to metamorphic →

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Physical properties

Formation & geological history

Likely consolidated sand deposited in an ancient basin and cemented by silica or iron oxides; if metamorphosed, it may be quartzite. The specimen’s age cannot be determined from the photograph.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and landscaping; quartzite is used as durable construction stone and aggregate. This small, uncharacteristic fragment has minimal commercial or jewelry value.

Geological facts

The rounded shape and brown coating may result from stream or soil weathering, while pale grains likely represent quartz. 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 bedding for sandstone, versus fused grains and very strong cohesion for quartzite; common worldwide, especially in river gravels and weathered outcrops. Exact identification requires a fresh surface or thin section.