metamorphic

Rounded metamorphic pebble, likely quartzite or weathered gneiss

Quartzite (mostly quartz, SiO₂) or micaceous gneiss; exact identification requires testing

AI-generated identification · may be incorrect

Gray-green, pink, and cream mottling with a dull to slightly sparkling luster; granular, compact texture and no obvious cleavage. Likely Mohs hardness 6.5–7 if quartzite, with specific gravity around 2.6–2.7.

Identified September 13, 2026More metamorphic →

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At a glance

Common name: Rounded metamorphic pebble, likely quartzite or weathered gneiss
Scientific name: Quartzite (mostly quartz, SiO₂) or micaceous gneiss; exact identification requires testing
Category: metamorphic
Identified: September 13, 2026
Method: Standard

AI Estimated Value

About $1–$10 as an ordinary pebble; $10–$30 if unusually attractive, polished, or locality-labeled.

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

Probably formed by metamorphism of quartz-rich sandstone or feldspathic rock, then rounded by stream or shoreline transport. Its precise geological age and source cannot be determined from the photograph.

Uses & applications

Commonly used as decorative stone, landscaping aggregate, paving, and sometimes lapidary material; this specimen appears mainly suitable for collecting.

Geological facts

The rounded shape indicates prolonged abrasion during transport. Pink areas may reflect feldspar or iron staining, while pale sparkles could be mica or quartz grains.

Field identification & locations

Test with a steel file or glass: quartzite should scratch glass and resist a knife; a vinegar test is generally negative. Common in mountain streams, glacial deposits, and gravel bars worldwide.