sedimentary

Tan quartz-rich rock, likely sandstone or weathered quartzite

Quartz sandstone; primarily SiO₂ with possible feldspar and iron-oxide cement

AI-generated identification · may be incorrect

Hardness about 6–7; tan-brown, granular, dull to slightly vitreous; no obvious cleavage. The visible texture appears fine to medium grained, though the image is insufficient to confirm sandstone versus quartzite.

Identified September 13, 2026More sedimentary →

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At a glance

Common name: Tan quartz-rich rock, likely sandstone or weathered quartzite
Scientific name: Quartz sandstone; primarily SiO₂ with possible feldspar and iron-oxide cement
Category: sedimentary
Identified: September 13, 2026
Method: Standard

AI Estimated Value

About $1–$10 as an ordinary loose specimen; attractive polished or locality-labeled pieces may sell for $10–$30.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Likely lithified sand deposited in an ancient river, beach, or dune environment, then cemented by silica or iron oxides; age cannot be determined from the photograph. If metamorphosed, it could instead be quartzite.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and decorative pieces; quartzite is used for countertops, flooring, crushed stone, and sometimes carving.

Geological facts

The brown coloration commonly comes from iron-oxide staining. A strong acid reaction would suggest carbonate cement, while a glassy fracture and very high resistance to scratching suggest quartzite.

Field identification & locations

Look for visible sand grains and moderate scratching by steel for sandstone; quartzite is typically harder, more crystalline, and scratches glass. Common worldwide in sedimentary basins and metamorphic belts.