mineral

Tumbled chalcedony or quartzite pebble

Microcrystalline quartz, SiO₂ (likely chalcedony; exact identification requires testing)

AI-generated identification · may be incorrect

Pale lavender-gray to cream, opaque to slightly translucent, with a smooth water-worn/tumbled surface and dull-to-waxy luster. Quartz hardness is about 7 Mohs; no visible cleavage, conchoidal fracture, and specific gravity near 2.6.

Identified September 16, 2026More mineral →

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At a glance

Common name: Tumbled chalcedony or quartzite pebble
Scientific name: Microcrystalline quartz, SiO₂ (likely chalcedony; exact identification requires testing)
Category: mineral
Identified: September 16, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common tumbled pebble; $10–$40 if unusually attractive, translucent, or sold as a polished lapidary specimen.

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 as silica-rich material in a volcanic or sedimentary environment, then rounded naturally or by tumbling; its precise geological age and source cannot be determined from the image.

Uses & applications

Used for lapidary cabochons, beads, carvings, and decorative stones; common pieces have limited jewelry value.

Geological facts

The lavender tint may reflect trace iron, manganese, or other impurities, but color alone cannot confirm amethyst. A steel blade should not scratch quartz, while quartz should scratch ordinary glass.

Field identification & locations

Common as rounded stream, beach, or landscaping pebbles worldwide, especially in quartz-rich terrains. Confirm with hardness, a glass-scratch test, translucency, and specific-gravity testing; acid testing is generally uninformative.