mineral
Polished orange agate (likely carnelian)
Chalcedony, microcrystalline quartz (SiO₂); orange-red variety commonly called carnelian
AI-generated identification · may be incorrectOrange-brown, slightly translucent, with a waxy to vitreous polish and no visible cleavage; Mohs hardness 6.5–7, trigonal quartz structure, specific gravity about 2.6. The small polished piece obscures its natural banding, so exact identification is uncertain.
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Physical properties
Orange-brown, slightly translucent, with a waxy to vitreous polish and no visible cleavage; Mohs hardness 6.5–7, trigonal quartz structure, specific gravity about 2.6. The small polished piece obscures its natural banding, so exact identification is uncertain.
Formation & geological history
Silica-rich groundwater deposited microscopic quartz in rock cavities, later colored by iron oxides; agate deposits form in volcanic and other host rocks over geological time.
Uses & applications
Used for beads, cabochons, carvings, and decorative objects; agate is also used for small industrial components and ornaments.
Geological facts
Carnelian is a traditional variety of chalcedony, prized since antiquity for seals and jewelry.
Field identification & locations
Look for hardness, waxy luster, translucence, and—on unpolished material—distinct bands or mottling. Agate is widespread, especially in volcanic regions; confirm carnelian by examining color and translucence against strong light.
