mineral

Tumbled amber-colored chalcedony and quartz

Chalcedony (microcrystalline SiO₂), quartz (SiO₂), possibly carnelian or citrine; one piece may be druzy chalcedony

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent yellow, orange, honey, and gray colors; waxy to vitreous luster; cryptocrystalline chalcedony or crystalline quartz, with no obvious cleavage and conchoidal fracture. Rounded surfaces indicate tumbling and polishing.

Identified September 22, 2026More mineral →

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At a glance

Common name: Tumbled amber-colored chalcedony and quartz
Scientific name: Chalcedony (microcrystalline SiO₂), quartz (SiO₂), possibly carnelian or citrine; one piece may be druzy chalcedony
Category: mineral
Identified: September 22, 2026
Method: Standard

AI Estimated Value

About $5–$25 for this mixed tumbled lot; $10–$75 per attractive larger or well-identified 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

Silica-rich fluids deposited chalcedony in cavities and fractures, while quartz crystallized in veins or geodes; coloration commonly comes from iron oxides. Specimen ages vary widely by locality, generally Paleozoic to Cenozoic.

Uses & applications

Used as lapidary material for cabochons, beads, carvings, and decorative stones; common tumbled specimens are primarily collectible or ornamental.

Geological facts

Orange-red chalcedony is called carnelian; yellow varieties may be marketed as yellow chalcedony, citrine, or honey quartz. Some commercial stones may be heat-treated or dyed.

Field identification & locations

Identify by hardness, translucent waxy appearance, conchoidal fracture, and inability to scratch with a steel blade; quartz should scratch glass. Exact species and locality require testing or seller information.