metamorphic

Weathered quartz-rich rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar or iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale tan, cream, and white with earthy brown staining; generally vitreous to dull luster, granular texture, and no obvious cleavage. The rounded shape and smooth surface indicate natural weathering or tumbling.

Identified September 11, 2026More metamorphic →

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At a glance

Common name: Weathered quartz-rich rock, likely quartzite
Scientific name: Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar or iron-oxide staining
Category: metamorphic
Identified: September 11, 2026
Method: Standard

AI Estimated Value

About $1–$10 as a common hand specimen; $10–$30 if unusually attractive, polished, or locality-documented.

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

Forms when quartz-rich sandstone is recrystallized under heat and pressure, commonly during mountain building; age depends on its parent formation and cannot be determined from the photograph.

Uses & applications

Used as crushed stone, aggregate, paving, and decorative landscape rock; attractive pieces may be polished for display, but this specimen appears modestly collectible.

Geological facts

Quartzite commonly preserves no obvious sand grains because recrystallized quartz grains interlock tightly, making it resistant to scratching and weathering.

Field identification & locations

Likely quartzite if it scratches glass and shows fused quartz grains; acid testing is usually negative. Common worldwide in metamorphic mountain belts, including the Appalachians, Rocky Mountains, and Scandinavian mountains.