sedimentary

Conglomeratic sandstone or breccia specimen

Quartz-rich clastic sedimentary rock; likely sandstone with pebble-sized quartz, feldspar, and lithic clasts

AI-generated identification · may be incorrect

Tan-brown, coarse-grained, poorly sorted, and weakly cemented, with prominent white angular to rounded clasts and dark lithic grains. Quartz is Mohs 7 with vitreous luster; the matrix is likely siliceous or calcareous, so hardness and acid reaction may vary.

Identified September 10, 2026More sedimentary →

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At a glance

Common name: Conglomeratic sandstone or breccia specimen
Scientific name: Quartz-rich clastic sedimentary rock; likely sandstone with pebble-sized quartz, feldspar, and lithic clasts
Category: sedimentary
Identified: September 10, 2026
Method: Standard

AI Estimated Value

Typically $5–$25 for an ordinary hand specimen; approximately $25–$75 if attractive, unusual, or locality-labeled.

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 and gravel accumulated in a high-energy river, alluvial-fan, or shoreline environment and lithified by compaction and cementation. Its exact geological age cannot be determined from the photograph.

Uses & applications

Primarily a collecting specimen; related sandstone and conglomerate are used as building stone, aggregate, and occasionally ornamental stone. It has little jewelry value unless unusually colorful, durable, or fossiliferous.

Geological facts

The mixed grain sizes and visible clasts indicate sedimentary transport and deposition rather than a single crystalline mineral. The white material may be quartz, calcite, or weathered feldspar.

Field identification & locations

Identify it by visible rounded or angular grains embedded in a finer matrix; a dilute acid test can distinguish calcite cement by fizzing, while a glass-scratch test helps assess quartz. Common in river, fan, and conglomerate-bearing sedimentary formations worldwide.