metamorphic

Weathered quartz-rich rock, possibly quartzite

Quartzite (mostly SiO₂), though a feldspathic sandstone or weathered granite fragment is also possible

AI-generated identification · may be incorrect

Tan, irregular, fine-to-medium granular specimen with dull earthy luster and no obvious crystal faces; apparent hardness about 6–7 Mohs, with little or no cleavage. The surface looks weathered and may contain quartz and feldspar grains.

Identified September 6, 2026More metamorphic →

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At a glance

Common name: Weathered quartz-rich rock, possibly quartzite
Scientific name: Quartzite (mostly SiO₂), though a feldspathic sandstone or weathered granite fragment is also possible
Category: metamorphic
Identified: September 6, 2026
Method: Standard

AI Estimated Value

Usually $1–$10 as an unremarkable loose specimen; potentially $10–$30 if provenance or appearance is distinctive.

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

Likely formed from compacted sandstone metamorphosed into quartzite, or alternatively represents weathered igneous rock; exact age and origin cannot be determined from the photograph alone. Quartzite commonly forms during regional metamorphism under heat and pressure.

Uses & applications

Quartzite is used as crushed aggregate, building stone, paving, and decorative material; attractive pieces may be collected, but this specimen appears ordinary.

Geological facts

Quartzite is typically resistant to scratching and weathering, and its quartz grains may fuse into a hard mosaic. A steel nail should not scratch it, while it can scratch glass.

Field identification & locations

Common in metamorphic terrains and mountain belts worldwide. Confirm with a fresh surface, hardness test, and acid test; visible feldspar or dark minerals would favor granite or sandstone rather than pure quartzite.