mineral

Yellow-orange chalcedony (possibly carnelian)

Microcrystalline quartz, SiO₂; orange coloration commonly from iron oxides

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent orange-yellow body with waxy to dull luster, conchoidal fracture, and no cleavage. It is cryptocrystalline quartz, so individual crystals are not visible.

Identified September 14, 2026More mineral →

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At a glance

Common name: Yellow-orange chalcedony (possibly carnelian)
Scientific name: Microcrystalline quartz, SiO₂; orange coloration commonly from iron oxides
Category: mineral
Identified: September 14, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a common rough specimen; attractive translucent or strongly colored lapidary-grade pieces may bring $30–$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-yellow body with waxy to dull luster, conchoidal fracture, and no cleavage. It is cryptocrystalline quartz, so individual crystals are not visible.

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures in volcanic rocks, followed by slow quartz precipitation; iron produces the orange color. Typically Cenozoic to older, depending on its host rock.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and lapidary pieces; massive material has limited industrial value compared with ordinary quartz.

Geological facts

Carnelian is the red-orange variety of chalcedony, while paler yellow-orange material may be called yellow chalcedony or sard. Heating can intensify or alter its color.

Field identification & locations

Identify by its waxy appearance, translucency, hardness, and conchoidal fracture; it should resist scratching by a steel knife and not fizz in dilute acid. Common sources include India, Brazil, Uruguay, Madagascar, and the western United States.