mineral

Tumbled orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian

AI-generated identification · may be incorrect

Pale orange to salmon, translucent, waxy-to-dull luster, and rounded from tumbling or natural abrasion. Quartz hardness is about 7 Mohs, with no cleavage and conchoidal fracture; the image is too blurred to confirm internal banding or texture.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures, with iron oxides producing orange-red color; commonly Cenozoic or older depending on host rock. The specimen appears human-tumbled or smoothly water-worn.

Uses & applications

Used for beads, cabochons, carvings, and inexpensive collector specimens; also used ornamentally in small decorative objects. Typical value is about $2–$15, or $10–$40 for a larger, strongly colored polished piece.

Geological facts

Carnelian is a translucent orange-red variety of chalcedony, while paler material may be called orange chalcedony or sard. Color can intensify with heat treatment.

Field identification & locations

Field clues include hardness sufficient to scratch ordinary glass, waxy luster, translucency at thin edges, and conchoidal fracture; it should not fizz in dilute acid. Common sources include India, Brazil, Uruguay, Madagascar, and parts of Europe. Around 47.6°N, 19.3°E, transported chalcedony/carnelian gravel is plausible, though a local source cannot be determined from the photo.