mineral

Orange-pink chalcedony (likely carnelian/chalcedony rough)

Microcrystalline quartz, SiO₂; iron-oxide-bearing chalcedony

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, waxy to glassy luster, translucent orange, peach, white, and gray banding, and no visible cleavage; composed of fibrous cryptocrystalline quartz. The irregular fracture and translucent silica-rich texture are consistent with chalcedony, though the image alone cannot exclude agate or quart…

Identified September 4, 2026More mineral →

Explore Orange-pink chalcedony (likely carnelian/chalcedony rough) in the encyclopedia →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures in volcanic rocks, later depositing quartz fibers and iron oxides; commonly Cenozoic to older, depending on host rock. Iron produces the orange-red coloration.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and lapidary slabs; massive material has limited industrial use compared with ordinary quartz.

Geological facts

Carnelian is the orange-red variety of chalcedony, while agate is banded chalcedony. Heating can intensify pale chalcedony’s red-orange color.

Field identification & locations

Look for translucent edges, waxy luster, conchoidal fracture, and hardness sufficient to scratch glass; test inconspicuously because scratching reduces specimen value. Common localities include Brazil, Uruguay, India, Madagascar, Mexico, and the United States.