metamorphic

Weathered quartz-rich metamorphic rock, likely quartzite

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

AI-generated identification · may be incorrect

Hardness about 7 Mohs; gray, white, tan, and rusty-brown coloration with a dull to slightly glassy luster. Massive, nonfoliated texture and no obvious cleavage; exact specific gravity is likely around 2.6–2.7.

Identified August 8, 2026More metamorphic →

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At a glance

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

AI Estimated Value

Approximately $1–$10 as a common rough specimen; distinctive or attractive collector pieces may reach $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 during mountain building. Its precise geological age cannot be determined from the photograph.

Uses & applications

Used as durable building stone, aggregate, paving, and decorative material; attractive pieces may be polished for ornamental objects, though this specimen appears ordinary and unprocessed.

Geological facts

Quartzite commonly breaks across quartz grains rather than around them, producing a tough, irregular fracture. Brown zones likely reflect limonite or hematite weathering.

Field identification & locations

Identify it by its granular quartz appearance, exceptional hardness, and resistance to scratching by steel; unlike sandstone, it usually does not crumble along bedding. Common in metamorphic mountain belts worldwide, including the Appalachians, Alps, India, and Brazil.