metamorphic

Weathered quartz-rich rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or iron-oxide impurities

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale gray to tan with brown weathering, granular texture, and glassy to dull luster. Quartz has no cleavage and conchoidal fracture; the specimen appears heavily rounded and weathered.

Identified September 10, 2026More metamorphic →

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At a glance

Common name: Weathered quartz-rich rock, likely quartzite
Scientific name: Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or iron-oxide impurities
Category: metamorphic
Identified: September 10, 2026
Method: Standard

AI Estimated Value

About $1–$10 as a common hand specimen; perhaps $10–$30 if unusually attractive, labeled, or from a notable locality.

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 recrystallized under heat and pressure during metamorphism, commonly in Precambrian to younger mountain belts. Its rounded shape suggests stream, glacial, or beach transport after erosion.

Uses & applications

Used as crushed stone, road aggregate, building stone, slabs, and landscaping material; attractive varieties may be polished or collected. This nondescript specimen has little jewelry value.

Geological facts

Quartzite is typically harder and more resistant to weathering than its sandstone precursor. Iron oxides can produce the tan-brown surface staining visible here.

Field identification & locations

Test with a steel knife or glass: genuine quartzite usually scratches glass and resists a knife. Common worldwide, especially in metamorphic mountain regions; confirmation would require a fresh break or acid-free mineral testing.