mineral

Tumbled amber-colored quartz/chalcedony (likely carnelian or honey agate)

Microcrystalline quartz, SiO₂; coloration may derive from iron oxides

AI-generated identification · may be incorrect

Translucent orange-brown, vitreous to waxy luster, no visible cleavage, conchoidal fracture, and typically Mohs hardness 6.5–7; rounded surfaces indicate tumbling. The photograph alone cannot reliably distinguish carnelian, honey agate, or iron-stained quartz.

Identified September 15, 2026More mineral →

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At a glance

Common name: Tumbled amber-colored quartz/chalcedony (likely carnelian or honey agate)
Scientific name: Microcrystalline quartz, SiO₂; coloration may derive from iron oxides
Category: mineral
Identified: September 15, 2026
Method: Standard

AI Estimated Value

About $1–$10 for common tumbled pieces; $10–$50+ if strongly banded, unusually translucent, or sold as quality jewelry material.

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

Forms when silica-rich groundwater fills cavities or fractures, later acquiring iron staining; agate develops concentric banding. These pieces are likely polished or naturally water-worn fragments from relatively young sedimentary or volcanic-hosted deposits.

Uses & applications

Used for beads, cabochons, carvings, jewelry, and decorative objects; quartz aggregates also have industrial applications.

Geological facts

Carnelian is the orange-red variety of chalcedony, while agate is banded chalcedony. A glassy appearance, lack of cleavage, and resistance to scratching help separate quartz varieties from amber or glass.

Field identification & locations

Common sources include Brazil, Uruguay, India, Madagascar, and the western United States. Check for microscopic banding, bubbles, or uniform coloration; quartz should scratch ordinary glass but not be scratched by a steel knife.