mineral

Tumbled orange-and-white chalcedony

Chalcedony, microcrystalline quartz (SiO₂), likely orange carnelian/white agate variety

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; waxy to vitreous luster; translucent orange, cream, and white coloration; cryptocrystalline quartz with no visible cleavage and conchoidal fracture. The smooth rounded surface indicates tumbling and polishing.

Identified September 15, 2026More mineral →

Explore Tumbled orange-and-white chalcedony in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures in volcanic rocks, commonly during the Cenozoic or older geologic episodes. Orange color typically comes from iron-oxide inclusions or staining.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive jewelry; also popular as a lapidary and décor stone.

Geological facts

Carnelian is orange chalcedony, while agate is banded or variably patterned chalcedony; this specimen appears more mottled than distinctly banded.

Field identification & locations

Common sources include Brazil, Uruguay, India, Madagascar, Botswana, and the United States. Identify it by its hardness, waxy appearance, translucent silica body, and resistance to scratching by steel; dyeing or heat treatment is possible.