sedimentary

Iron-stained breccia or weathered conglomerate pebble

Clastic sedimentary rock; likely quartz-rich sandstone/breccia with dark mafic or iron-manganese fragments

AI-generated identification · may be incorrect

Tan, fine-to-medium clastic matrix with irregular dark gray-black patches; likely Mohs 5–7, dull to earthy luster, no visible cleavage, and probable quartz-bearing composition. The rounded shape indicates natural water abrasion or tumbling.

Identified August 25, 2026More sedimentary →

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At a glance

Common name: Iron-stained breccia or weathered conglomerate pebble
Scientific name: Clastic sedimentary rock; likely quartz-rich sandstone/breccia with dark mafic or iron-manganese fragments
Category: sedimentary
Identified: August 25, 2026
Method: Standard

AI Estimated Value

About $1–$10 as an ordinary pebble; up to $15–$30 if unusually patterned, polished, or locally significant.

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 rock fragments were compacted and cemented, then weathered and rounded in a stream, beach, or gravel deposit; age cannot be determined from the photograph. Dark areas may be basaltic fragments or manganese/iron-oxide staining.

Uses & applications

Primarily a curiosity, teaching specimen, or craft stone; not typically used commercially unless part of a larger aggregate or decorative stone deposit.

Geological facts

The contrasting pattern resembles a small breccia or conglomerate rather than a single crystal mineral. A streak, acid, and hardness test would help distinguish cement and composition.

Field identification & locations

Look for visible grains, cemented fragments, and resistance to scratching by a steel knife; quartz-rich material scratches glass, while carbonate cement may effervesce in dilute acid. Common in stream gravels and sedimentary terrains worldwide.