metamorphic

Weathered quartz-rich metamorphic rock, possibly quartzite or gneiss

Quartz-dominant silicate rock; likely quartz (SiO₂) with feldspar, mica, and minor iron-oxide staining

AI-generated identification · may be incorrect

Gray, tan, and brown, with a massive to weakly foliated texture, glassy-to-dull luster, and irregular fracture; quartz has Mohs hardness 7, while the whole rock is typically ~6–7. Crystals are interlocking and mostly too fine or weathered to distinguish clearly.

Identified September 19, 2026More metamorphic →

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At a glance

Common name: Weathered quartz-rich metamorphic rock, possibly quartzite or gneiss
Scientific name: Quartz-dominant silicate rock; likely quartz (SiO₂) with feldspar, mica, and minor iron-oxide staining
Category: metamorphic
Identified: September 19, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an unverified common specimen; potentially $10–$30 if locality, mineral associations, or unusual texture are 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

Likely formed when quartz-rich sandstone or igneous material was recrystallized under elevated temperature and pressure, then rounded and weathered at the surface. Its exact geological age cannot be determined from the photograph.

Uses & applications

Suitable mainly as a teaching or display specimen; quartzite can be used as aggregate, dimension stone, and landscaping rock, but this weathered piece has little commercial value.

Geological facts

The tan-to-brown patches are consistent with iron-oxide alteration, while the green spot may be chlorite, epidote, or another minor mineral. A glass-scratch test can help confirm abundant quartz.

Field identification & locations

Common in metamorphic terrains and stream gravels worldwide; inspect for visible foliation, quartz grains, and hardness. A fresh broken surface and streak, acid, or laboratory testing would be needed for confident identification.