metamorphic

Polished jasper–quartzite river pebble

Silicified metasedimentary rock, chiefly microcrystalline quartz (SiO₂) with iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; tan, cream, gray, and rusty-brown banding; waxy to dull luster; massive, fine-grained texture with no obvious cleavage. The rounded, polished surface indicates water abrasion or intentional tumbling.

Identified September 10, 2026More metamorphic →

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At a glance

Common name: Polished jasper–quartzite river pebble
Scientific name: Silicified metasedimentary rock, chiefly microcrystalline quartz (SiO₂) with iron-oxide staining
Category: metamorphic
Identified: September 10, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 as a common polished specimen; $30–$100+ if unusually attractive, large, or from a documented 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

Likely formed when silica-rich sedimentary material was lithified and later silicified or weakly metamorphosed, with hematite/goethite producing the brown coloration. Its precise geological age and locality cannot be determined from the image.

Uses & applications

Used as a lapidary stone for cabochons, carvings, decorative polished pieces, and collection specimens; not generally important as construction aggregate in this small form.

Geological facts

The pale bands are quartz-rich zones, while dark pits and rusty areas may represent iron oxides or weathered inclusions. It may be marketed informally as jasper, quartzite, or “picture jasper,” though laboratory testing is needed for a definitive name.

Field identification & locations

Identify by its silica hardness, inability to scratch with a steel knife, opaque banding, and lack of visible large crystals; common in gravel beds and silica-rich metamorphic terrains. Value is mainly aesthetic and depends on pattern and polish.