sedimentary

Weathered gray sandstone or fine-grained metamorphic rock

Likely quartz-rich sandstone (quartz arenite), possibly weakly metamorphosed metasandstone

AI-generated identification · may be incorrect

Fine-grained, dull earthy luster, gray-green to brown weathering, and massive texture with a pale vein or fracture filling. Likely hardness about 6–7 if quartz-rich; cleavage absent, specific gravity roughly 2.6.

Identified September 13, 2026More sedimentary →

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At a glance

Common name: Weathered gray sandstone or fine-grained metamorphic rock
Scientific name: Likely quartz-rich sandstone (quartz arenite), possibly weakly metamorphosed metasandstone
Category: sedimentary
Identified: September 13, 2026
Method: Standard

AI Estimated Value

Typically $5–$25 as an ordinary hand specimen; unusual provenance, visible fossils, or an attractive mineral-filled fracture may raise value to roughly $30–$100.

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

Probably lithified quartz-rich sand compacted and cemented in an ancient sedimentary basin, potentially later mildly metamorphosed; exact age and origin cannot be determined from the photograph. The light seam may be quartz or calcite filling a fracture.

Uses & applications

Common sandstone is used for building stone, paving, landscaping, aggregate, and sometimes carving; attractive pieces may be collected as geological specimens. This example appears more suitable for study or display than jewelry.

Geological facts

The rounded form and weathered surface suggest transport or prolonged surface erosion. A vinegar test can help distinguish calcite cement or vein material from quartz, while a steel file or glass-scratch test helps estimate hardness.

Field identification & locations

Look for visible sand grains, quartz-rich sparkle, bedding, and a reaction to dilute hydrochloric acid; quartz-rich material does not fizz, whereas calcite-bearing material does. Common sources include sedimentary basins worldwide, but location is not identifiable from the image.