gemstone

Orange chalcedony (likely carnelian), polished shard

Microcrystalline quartz, SiO₂; chalcedony variety, orange iron-oxide coloration

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent orange to reddish-orange, vitreous to waxy luster, cryptocrystalline structure, no cleavage, conchoidal fracture; specific gravity about 2.6.

Identified August 8, 2026More gemstone →

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At a glance

Common name: Orange chalcedony (likely carnelian), polished shard
Scientific name: Microcrystalline quartz, SiO₂; chalcedony variety, orange iron-oxide coloration
Category: gemstone
Identified: August 8, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 for a small common polished fragment; higher-quality natural, vividly colored cabochons may sell for $20–$100.

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

Mohs hardness 6.5–7; translucent orange to reddish-orange, vitreous to waxy luster, cryptocrystalline structure, no cleavage, conchoidal fracture; specific gravity about 2.6.

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures, later acquiring orange-red color from dispersed iron oxides. Chalcedony deposits range from ancient volcanic environments to younger sedimentary settings.

Uses & applications

Used for beads, cabochons, carvings, lapidary pieces, and ornamental objects; this narrow polished fragment has modest decorative value.

Geological facts

Carnelian is the orange-red chalcedony variety, while paler orange material may be called orange chalcedony. Strongly dyed or coated agate can look similar, so color zoning and surface coatings should be checked.

Field identification & locations

Common sources include India, Brazil, Uruguay, Madagascar, Germany, and the United States. Identify it by hardness, waxy translucence, conchoidal fracture, and resistance to scratching by steel; an exact identification may require testing for dye or coating.