metamorphic

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), with possible feldspar, mica, and iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale cream to tan with rusty brown patches, uneven granular texture, and vitreous to dull luster. Quartz grains are typically interlocked, with no obvious cleavage; exact identification is limited by the weathered surface.

Identified September 8, 2026More metamorphic →

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At a glance

Common name: Weathered quartz-rich metamorphic rock, likely quartzite
Scientific name: Quartzite; predominantly quartz (SiO₂), with possible feldspar, mica, and iron-oxide staining
Category: metamorphic
Identified: September 8, 2026
Method: Standard

AI Estimated Value

About $2-$15 for a common hand specimen; distinctive, attractive, or locality-labeled specimens may sell for $20-$50.

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 during regional metamorphism, commonly from Precambrian to Paleozoic mountain-building events. Iron oxides likely developed through later weathering.

Uses & applications

Used as crushed stone, road aggregate, building stone, countertops, and decorative landscaping; attractive pieces may be collected but are generally low value.

Geological facts

Quartzite commonly breaks across grains rather than around them, producing very hard, sharp surfaces. It can resemble marble or strongly cemented sandstone, but usually resists scratching by a steel knife.

Field identification & locations

Common in metamorphic mountain belts worldwide, including the Appalachian, Rocky, and European mountain regions. Field tests: scratches glass, does not fizz with dilute hydrochloric acid, and shows a sugary quartz texture; a fresh fracture would improve certainty.