sedimentary

Weathered sandstone boulder

Sandstone, chiefly quartz (SiO₂) with feldspar and iron-oxide cement

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7, tan to gray-brown, dull to slightly gritty, and composed of visible sand-sized grains; it may show bedding, pores, and iron staining. The photograph is low-resolution, so exact mineralogy and texture cannot be confirmed.

Identified September 20, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone boulder
Scientific name: Sandstone, chiefly quartz (SiO₂) with feldspar and iron-oxide cement
Category: sedimentary
Identified: September 20, 2026
Method: Standard

AI Estimated Value

Approximately $0–$50 as an ordinary landscape stone; specialty fossiliferous, unusually colored, or collectible sandstone specimens may sell for $25–$200+.

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 was deposited, compacted, and cemented in ancient rivers, beaches, dunes, or shallow seas; age cannot be determined from the image. Weathering has rounded the exposed surface and darkened portions with biological or mineral staining.

Uses & applications

Commonly used as building stone, paving, landscaping rock, aggregate, and occasionally sculpture material. This ordinary outdoor boulder has little jewelry or collector value.

Geological facts

Sandstone strength and color depend strongly on cement type: silica makes it durable, while clay or calcite cement makes it softer and more weatherable. The dark surface may be lichen, soil, or weathering rather than a distinct mineral.

Field identification & locations

Look for gritty texture, sand-sized grains, layered bedding, and scratching resistance greater than steel with quartz-rich varieties; acid testing can distinguish calcareous sandstone. Common worldwide, especially in sedimentary basins and glaciated areas.