metamorphic

Weathered quartz-rich metamorphic rock, probably quartzite

Quartzite; predominantly microcrystalline SiO₂, possibly with feldspar and iron-oxide staining

AI-generated identification · may be incorrect

Appears pale pink, gray, and brown with a dull weathered surface and massive texture; likely hardness about 7 Mohs, vitreous to dull luster, with no obvious cleavage. The image is slightly blurred, so mineral grains and texture cannot be confirmed.

Identified September 14, 2026More metamorphic →

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At a glance

Common name: Weathered quartz-rich metamorphic rock, probably quartzite
Scientific name: Quartzite; predominantly microcrystalline SiO₂, possibly with feldspar and iron-oxide staining
Category: metamorphic
Identified: September 14, 2026
Method: Standard

AI Estimated Value

Usually $1–$10 as a common roadside specimen; $10–$30 if unusually attractive, fresh, or polished.

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 intensely metamorphosed, recrystallizing the grains into an interlocking quartz mosaic. Its age depends on the source formation; roadside exposure may represent weathered metamorphic bedrock or transported gravel.

Uses & applications

Crushed quartzite is used for aggregate, roadstone, and construction; attractive pieces may be collected or used decoratively, though this specimen appears ordinary.

Geological facts

A steel nail should not scratch fresh quartzite, while quartzite can scratch glass. Brown coloration commonly reflects iron oxides; pink tones may indicate feldspar or staining.

Field identification & locations

Likely identifiable by its very hard, quartz-rich surface and granular fracture, but a close fresh break and scratch test are needed. Around 10.6°N, 61.1°W, transported metamorphic rock is plausible, although roadside gravel may come from elsewhere.