sedimentary

Weathered quartz-rich rock, possibly sandstone or quartzite

Indeterminate; likely quartz sandstone (SiO₂-rich), possibly weakly metamorphosed quartzite

AI-generated identification · may be incorrect

Pale tan-gray, earthy to slightly sparkly surface with granular texture and irregular weathering; individual grains are not clearly resolved. Quartz has Mohs hardness 7, vitreous luster, no cleavage, and sandstone is typically porous, whereas quartzite is harder and more massive.

Identified August 9, 2026More sedimentary →

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At a glance

Common name: Weathered quartz-rich rock, possibly sandstone or quartzite
Scientific name: Indeterminate; likely quartz sandstone (SiO₂-rich), possibly weakly metamorphosed quartzite
Category: sedimentary
Identified: August 9, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 as an unattributed common specimen; $10–$30 if tied to a documented locality or distinctive quartzite texture.

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 cemented quartz-rich sand, commonly during the Paleozoic–Mesozoic; if quartzite, later burial and metamorphism recrystallized the grains. The visible roughness and iron staining are consistent with surface weathering.

Uses & applications

Quartz sandstone is used as building stone, aggregate, and glass-making feedstock; quartzite is used for durable countertops, paving, and decorative stone. This specimen has little commercial value unless locality or texture is unusual.

Geological facts

The specimen’s rounded outline may reflect natural abrasion or human shaping, but the image alone cannot establish this. A fresh broken surface and acid, streak, and hardness tests would improve identification.

Field identification & locations

Common in sedimentary basins and metamorphic belts worldwide. Scratch testing with steel or glass, observing grain boundaries, and checking whether grains break apart can distinguish sandstone from quartzite.