sedimentary

Weathered quartz-rich sandstone

Quartz arenite or feldspathic sandstone, composed mainly of SiO₂ quartz grains with possible feldspar and iron-oxide cement

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 for quartz grains, tan to pale brown, granular texture, and dull to glassy luster on fresh grains; bedding or cement may be obscured by weathering. The specimen appears porous and irregular, but an image cannot confirm mineral proportions.

Identified August 15, 2026More sedimentary →

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At a glance

Common name: Weathered quartz-rich sandstone
Scientific name: Quartz arenite or feldspathic sandstone, composed mainly of SiO₂ quartz grains with possible feldspar and iron-oxide cement
Category: sedimentary
Identified: August 15, 2026
Method: Standard

AI Estimated Value

Usually $1–$10 as an unverified hand specimen; $10–$30 if unusually attractive, labeled, or from a notable locality.

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 accumulated, was compacted, and cemented by silica, carbonate, or iron oxides; age depends on its geologic setting and cannot be determined visually. Weathering has rounded and stained the exposed surface.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and occasionally silica source; attractive pieces are collected but generally have little gem value.

Geological facts

Quartz-rich sandstone commonly survives weathering better than softer surrounding rocks, producing loose cobbles and outcrops. Iron-oxide cement creates the warm tan coloration visible here.

Field identification & locations

Look for visible sand-sized grains, rough granular fracture, and possible layering; a steel nail should not easily scratch quartz-rich grains. Common worldwide, especially in former beaches, river channels, deserts, and sedimentary basins.