sedimentary

Gray sandstone or weathered volcanic rock

Likely quartz-rich sandstone; exact identification is uncertain from the image alone

AI-generated identification · may be incorrect

Pale gray, fine- to medium-grained, dull and granular with no visible crystals or cleavage; likely Mohs hardness about 6–7 if quartz-rich, with moderate porosity and specific gravity around 2.2–2.7.

Identified September 4, 2026More sedimentary →

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At a glance

Common name: Gray sandstone or weathered volcanic rock
Scientific name: Likely quartz-rich sandstone; exact identification is uncertain from the image alone
Category: sedimentary
Identified: September 4, 2026
Method: Standard

AI Estimated Value

About $0–$5 as an ordinary loose specimen; potentially $10–$30 if it proves to be an attractive or unusual local geological sample.

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

If sandstone, it formed from compacted and cemented sand, commonly during a sedimentary basin’s burial history; its geological age cannot be determined visually. The surrounding surface appears artificial aggregate or weathered gravel, so the specimen may be a transported building or landscaping stone.

Uses & applications

Common sandstone is used for building stone, paving, walls, and landscaping; attractive varieties are cut for architectural or decorative use. This individual appears to have little commercial or collector value.

Geological facts

The rounded triangular shape indicates abrasion or human shaping rather than original outcrop form. A hand lens, streak test, acid test, and thin-section analysis would be needed for confident identification.

Field identification & locations

Look for visible quartz grains, bedding, and gritty texture; sandstone typically does not fizz with dilute hydrochloric acid unless carbonate-cemented. Common worldwide, especially in sedimentary basins and river, beach, or glacial deposits.