metamorphic

Quartz-rich metamorphic rock, likely quartzite

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

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale gray-white, granular, and vitreous to dull. Interlocking quartz grains give it massive structure, with little or no cleavage and specific gravity near 2.65.

Identified September 15, 2026More metamorphic →

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At a glance

Common name: Quartz-rich metamorphic rock, likely quartzite
Scientific name: Quartzite; predominantly crystalline quartz (SiO₂), possibly with feldspar and mica impurities
Category: metamorphic
Identified: September 15, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for a small common hand specimen; polished or unusually attractive examples may sell for $10–$30.

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

Hardness about 7 Mohs; pale gray-white, granular, and vitreous to dull. Interlocking quartz grains give it massive structure, with little or no cleavage and specific gravity near 2.65.

Formation & geological history

Formed when quartz-rich sandstone recrystallized under heat and pressure during regional metamorphism; its exact geological age cannot be determined from the image. The uneven brown-gray surface may reflect weathering or iron staining.

Uses & applications

Used as crushed stone, aggregate, building stone, paving, and occasionally decorative slabs; attractive pieces are collected but are generally low-value.

Geological facts

Quartzite commonly breaks across grains rather than around them, unlike weakly cemented sandstone. It can resemble marble, but quartzite is harder and does not fizz with dilute hydrochloric acid.

Field identification & locations

Likely quartzite based on its pale color, granular texture, and apparent hardness, though a close photograph cannot exclude quartz-rich sandstone or granitic material. Common occurrences include mountain belts and exposed sandstone formations worldwide.