metamorphic

Tumbled quartz-rich pebble, possibly quartzite

Quartz (SiO₂), likely in a quartzite or siliceous rock matrix

AI-generated identification · may be incorrect

Pale gray-green and cream, opaque to weakly translucent, with a dull to slightly vitreous luster and granular texture. Quartz has Mohs hardness 7, no cleavage, and conchoidal fracture; the rounded shape indicates tumbling or water wear.

Identified September 15, 2026More metamorphic →

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At a glance

Common name: Tumbled quartz-rich pebble, possibly quartzite
Scientific name: Quartz (SiO₂), likely in a quartzite or siliceous rock matrix
Category: metamorphic
Identified: September 15, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 as a common small tumbled or loose specimen; potentially higher only if laboratory identification reveals an attractive collectible variety.

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 metamorphosed under heat and pressure, commonly during mountain building; its exact geological age cannot be determined from the photograph. It may also be a weathered quartz vein fragment.

Uses & applications

Suitable as a low-cost teaching or display specimen, craft stone, or tumbled stone; quartzite is also used as aggregate, building stone, and refractory material. This specimen has little jewelry value unless it shows unusual color or pattern.

Geological facts

The greenish tone may come from chlorite, epidote, or other minor minerals, but photography alone cannot identify the coloring agent reliably.

Field identification & locations

Look for hardness sufficient to scratch ordinary glass, resistance to scratching by a steel knife, and abundant granular quartz; acid will not visibly react. Common sources include metamorphic belts and quartz-rich river gravels worldwide.