sedimentary

Mixed sandstone and iron-rich sedimentary rock fragments

Quartz arenite/subarkose, with ferruginous cement and possible iron-oxide staining

AI-generated identification · may be incorrect

Visible pieces are fine- to medium-grained, beige, tan, pink, and reddish, with mostly dull to slightly earthy luster and apparent clastic texture. Sandstone typically has Mohs hardness around 6–7 for quartz grains, but variable strength, porosity, and cementation;…

Identified August 19, 2026More sedimentary →

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At a glance

Common name: Mixed sandstone and iron-rich sedimentary rock fragments
Scientific name: Quartz arenite/subarkose, with ferruginous cement and possible iron-oxide staining
Category: sedimentary
Identified: August 19, 2026
Method: Standard

AI Estimated Value

About $0–$20 for common loose fragments; attractive polished or architectural pieces may sell for roughly $20–$100+, depending on size and provenance.

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

Formed when sand-sized grains accumulated, were compacted, and cemented in ancient rivers, beaches, dunes, or shallow marine environments; ages cannot be determined from the photograph and may range from Precambrian to recent. The specimens appear broken and possibly weathered or artificially arranged.

Uses & applications

Used as building stone, paving, aggregate, landscaping material, and occasionally decorative slabs or carvings; ordinary fragments have little jewelry value.

Geological facts

The color variation commonly results from hematite/goethite coatings, feldspar, or differing cement minerals. A dilute hydrochloric-acid reaction would suggest carbonate cement rather than ordinary quartz-rich sandstone.

Field identification & locations

Identify sandstone by visible sand grains, rough grainy surfaces, bedding or laminations, and lack of glassy crystals; quartz-rich pieces commonly scratch glass. Common worldwide, especially in sedimentary basins; provenance cannot be established from this image.