metamorphic

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-rich gneiss; predominantly SiO₂ (quartz) with possible feldspar and mica

AI-generated identification · may be incorrect

Coarse, irregularly interlocking pale-gray and bluish-gray grains with rusty iron-oxide staining; generally vitreous to dull luster, massive texture, and no obvious cleavage. Estimated hardness Mohs 6.5–7, with quartz-rich areas capable of scratching glass; specific gravity about 2.6–2.7.

Identified September 7, 2026More metamorphic →

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At a glance

Common name: Weathered quartz-rich metamorphic rock
Scientific name: Likely quartzite or quartz-rich gneiss; predominantly SiO₂ (quartz) with possible feldspar and mica
Category: metamorphic
Identified: September 7, 2026
Method: Standard

AI Estimated Value

Typically $0–$20 as an ordinary field specimen; roughly $20–$75 if unusually attractive, display-sized, or locally significant.

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

Probably formed when quartz-rich sandstone or an originally felsic rock was buried, heated, and recrystallized during regional metamorphism, commonly during Precambrian–Paleozoic mountain-building. Surface weathering produced the brown staining and rounded shape.

Uses & applications

Durable quartzite is used as crushed stone, aggregate, paving, wall stone, and occasionally decorative slabs; this weathered specimen has little commercial jewelry value.

Geological facts

The apparent pale patches may be quartz veins or feldspar-rich zones, while dark areas could represent mica, amphibole, or weathered inclusions.

Field identification & locations

Look for abundant hard quartz, granular fracture, and resistance to scratching; acid should produce no fizz unless carbonate contamination is present. Common in metamorphic terrains worldwide, including mountain belts and glacial deposits.