metamorphic

Weathered quartz-rich rock, possibly quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), identification uncertain from the photograph

AI-generated identification · may be incorrect

Pale gray to cream, granular and sparkling with a glassy to dull luster; quartz hardness is about Mohs 7, with no obvious cleavage and irregular fracture. The tan staining likely reflects iron oxides or surface weathering.

Identified September 15, 2026More metamorphic →

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At a glance

Common name: Weathered quartz-rich rock, possibly quartzite
Scientific name: Quartzite; predominantly microcrystalline quartz (SiO₂), identification uncertain from the photograph
Category: metamorphic
Identified: September 15, 2026
Method: Standard

AI Estimated Value

Typically $1-$10 for an ordinary hand specimen; perhaps $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

Quartzite forms when quartz-rich sandstone is recrystallized under heat and pressure during metamorphism, commonly during mountain-building; its exact geological age cannot be determined visually. The specimen may also be weathered quartz vein material.

Uses & applications

Used as crushed stone, aggregate, road material, architectural stone, and occasionally as a decorative or lapidary material; this irregular piece has little jewelry value.

Geological facts

Quartzite commonly breaks across quartz grains rather than around them and is generally harder than the original sandstone. The granular sparkle and resistant, rounded weathering are consistent with quartz-rich material.

Field identification & locations

Likely locations include metamorphic mountain belts and quartz-rich gravel deposits worldwide. A streak test, hardness test against glass, and close inspection for fused quartz grains versus sandstone layering would help confirm it.