metamorphic

Weathered quartz-rich rock, likely quartzite

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

AI-generated identification · may be incorrect

Hardness about 7 Mohs; white, tan, and reddish-brown mottling; vitreous to dull/waxy luster; granular interlocking quartz texture, with no obvious cleavage. The rounded shape and surface suggest natural weathering or water abrasion.

Identified September 5, 2026More metamorphic →

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At a glance

Common name: Weathered quartz-rich rock, likely quartzite
Scientific name: Quartzite; predominantly microcrystalline quartz (SiO₂), with possible iron-oxide staining and minor feldspar or mica
Category: metamorphic
Identified: September 5, 2026
Method: Standard

AI Estimated Value

Approximately $1-$10 as a common hand specimen; up to $20-$50 if unusually colorful, polished, or provenance-documented.

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

Likely formed when quartz-rich sandstone recrystallized under heat and pressure during regional metamorphism; iron-bearing fluids produced the brown-red staining. Its precise geological age cannot be determined from the photograph.

Uses & applications

Used as crushed stone, aggregate, paving, landscaping rock, and decorative stone; attractive pieces may be collected, though this specimen is not gem-grade.

Geological facts

Quartzite commonly breaks across quartz grains rather than around them, making fresh surfaces very hard and resistant to scratching. The reddish coloration is commonly caused by hematite or limonite coatings.

Field identification & locations

Common in metamorphic mountain belts and stream gravels worldwide. Confirm by testing an inconspicuous fresh edge: it should scratch ordinary glass and resist a steel knife; acid reaction would suggest carbonate contamination rather than pure quartzite.