sedimentary

Weathered brown rock, likely iron-stained sandstone

Quartz-rich sandstone (probable), chiefly SiO₂ with iron-oxide cement

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 for quartz grains; tan to brown, earthy to dull luster, visibly granular and poorly defined bedding. Exact identification is limited by the image; the surface appears weathered and iron-oxide stained.

Identified September 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized quartz and rock fragments were deposited, compacted, and cemented, commonly in rivers, beaches, or deserts; the specimen’s age cannot be determined visually and may range from Paleozoic to recent geological formations.

Uses & applications

Used as building stone, paving, aggregate, and silica source; attractive pieces may be collected, but this example appears primarily geological rather than gem-grade.

Geological facts

Brown coloration commonly results from hematite or goethite coatings and cement. A fresh break should reveal distinct sand grains, and dilute hydrochloric acid usually produces little or no reaction unless carbonate cement is present.

Field identification & locations

Common in sedimentary terrains worldwide, including the U.S. Southwest, England, India, and Australia; identify by gritty texture, visible grains, and possible layering. Estimated value: $1–$10 as an ordinary specimen, or up to $20–$50 if unusually patterned or locality-labeled.