gemstone

Polished carnelian agate point

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent orange-red to brown with a vitreous-to-waxy luster, cryptocrystalline structure, and no visible cleavage. The rounded internal banding and orbicular patterns indicate agate/chalcedony rather than glass.

Identified September 20, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities in volcanic rocks, depositing chalcedony and iron-bearing layers; commonly Cenozoic to older, depending on the host lava. This specimen has been cut and polished into a point.

Uses & applications

Used for cabochons, beads, carvings, ornamental points, and small decorative objects; durable enough for jewelry and display.

Geological facts

Carnelian is the orange-red variety of chalcedony, with color produced mainly by hematite or limonite. Heating can intensify its red-orange color.

Field identification & locations

Identify by its hardness, cool feel, subtle translucency, natural flow-like bands, and lack of bubbles or glassy conchoidal uniformity; common sources include Brazil, India, Uruguay, Madagascar, and the United States.