sedimentary

Weathered sandstone or volcanic rock fragment

Indeterminate; likely quartz–feldspar-rich sandstone, possibly altered volcanic rock

AI-generated identification · may be incorrect

Pale tan to gray-green, dull and granular, with irregular fracture and possible iron-oxide staining; hardness approximately 5–7 Mohs. No diagnostic crystals or cleavage are clearly visible in the image.

Identified August 14, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or volcanic rock fragment
Scientific name: Indeterminate; likely quartz–feldspar-rich sandstone, possibly altered volcanic rock
Category: sedimentary
Identified: August 14, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an unidentified common fragment; more if laboratory-tested, locality-specific, or shown to be a rare mineral specimen.

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 formed from compacted mineral grains or cooled volcanic material, then rounded and weathered at the surface; its geological age and exact formation environment cannot be determined visually.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and landscaping; this small fragment has mainly educational or modest collector value.

Geological facts

The greenish color may reflect chlorite, epidote, or other alteration minerals, while brown tones commonly indicate iron oxides. A fresh broken surface and hand lens would substantially improve identification.

Field identification & locations

Inspect grain size, acid reaction, streak, magnetism, and hardness; sandstone usually feels gritty and may contain visible quartz grains, whereas volcanic rock is typically more compact and crystalline. Common possibilities occur worldwide in sedimentary basins and volcanic terrains.