metamorphic

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar and mica impurities

AI-generated identification · may be incorrect

Typically white to gray, with a sugary or granular texture, vitreous to dull luster, and no obvious cleavage; quartzite has Mohs hardness about 7 and high resistance to scratching. The specimen appears weathered and iron-stained, with fractured rather than foliated fabric.

Identified September 18, 2026More metamorphic →

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At a glance

Common name: Quartz-rich metamorphic rock, likely quartzite
Scientific name: Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar and mica impurities
Category: metamorphic
Identified: September 18, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for a common hand specimen; distinctive or well-prepared specimens may sell for $15–$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 elevated temperature and pressure during regional or contact metamorphism. Its exact geological age cannot be determined from the photograph; it may occur in Precambrian through younger mountain belts.

Uses & applications

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

Geological facts

Quartzite commonly preserves little of the original sandstone texture because quartz grains fuse during metamorphism. It can resemble massive quartz or light-colored granite.

Field identification & locations

Common in metamorphic mountain regions and stream gravels. Field tests include scratching glass with difficulty and observing a sugary quartz texture; acid should produce no fizz unless carbonate minerals are present.