gemstone

Orange tumbled carnelian (likely)

Cryptocrystalline chalcedony, SiO₂; orange color commonly caused by iron oxides

AI-generated identification · may be incorrect

Small rounded, polished stone with orange-to-reddish color and waxy/glassy luster. Hardness 6.5–7 Mohs, trigonal microcrystalline quartz, no cleavage, specific gravity about 2.6; translucency and texture are difficult to confirm from the image.

Identified September 11, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures, later acquiring iron staining during weathering; deposits are generally Phanerozoic, with age depending on the host rock. Common sources include India, Brazil, Uruguay, Madagascar, and the United States.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive collector specimens; historically used for seals and amulets.

Geological facts

Carnelian is an orange variety of chalcedony, grading into red carnelian and brown sard. Heating can intensify or alter its color, and dyed orange chalcedony is also sold.

Field identification & locations

Identify by its uniform orange color, waxy luster, smooth conchoidal fracture, and ability to scratch glass while resisting a steel blade. Confirm with magnification and testing because orange glass, resin, and dyed agate can look similar.