sedimentary

Weathered sandstone or siltstone boulder

Indeterminate clastic sedimentary rock, likely quartz-rich sandstone (SiO₂-dominant)

AI-generated identification · may be incorrect

Brown-gray, dull to earthy luster, massive and fine-grained with rounded weathering surfaces; hardness roughly 5–7 if quartz-rich, with no visible cleavage. The dark lighting and limited detail prevent confident identification of grain size or cement.

Identified August 8, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or siltstone boulder
Scientific name: Indeterminate clastic sedimentary rock, likely quartz-rich sandstone (SiO₂-dominant)
Category: sedimentary
Identified: August 8, 2026
Method: Standard

AI Estimated Value

Typically $0–$100 as an ordinary landscaping boulder; unusual color, texture, locality, or documented provenance could raise value to roughly $100–$500.

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 or silt accumulated, compacted, and cemented into rock, typically in river, floodplain, beach, or shallow-marine settings; age cannot be determined from the image. Surface rounding and discoloration reflect prolonged weathering and soil exposure.

Uses & applications

Common sandstone is used for building stone, paving, walls, aggregate, and landscaping; this weathered boulder has mainly decorative or garden value.

Geological facts

Sandstone commonly shows visible grains, bedding, or iron-oxide staining, while siltstone appears smoother and finer. A fresh broken surface and a hand lens would greatly improve identification.

Field identification & locations

Common worldwide, especially in sedimentary basins. Check for gritty texture, layered bedding, and quartz grains; it should not fizz with dilute hydrochloric acid unless carbonate cement is present.