mineral

Banded Agate (specifically Carnelian Agate color)

Silicon Dioxide (SiO2) - variety of Chalcedony

Hardness: 6.5–7 on Mohs scale; Color: Translucent orange, amber, and cream bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.64.

Hardness: 6
Color: Translucent orange, amber, and cream bands
Luster: Waxy to vitreous

Identified March 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a secondary mineral in host rock cavities (usually volcanic lava vesicles) through the deposition of silica-rich groundwater. Over long periods, different mineral layers create the distinctive banding. Commonly found in Mesozoic to Cenozoic volcanic deposits.

Uses & applications

Used primarily in lapidary work for jewelry, cabochons, and beads. Historically used for making cylinder seals and signet rings. Also used in industry for precision mortars and pestles due to its hardness and resistance to chemicals.

Geological facts

In antiquity, carnelian-colored agates were believed to calm the temper and protect the wearer in battle. The name 'Agate' was given by the Greek philosopher Theophrastus, who discovered the stone along the Achates River in Sicily.

Field identification & locations

Identify in the field by its distinct concentric banding, waxy texture when polished, and lack of visible crystals. It is commonly found in Brazil, India, Madagascar, and the Lake Superior region of the US. It is translucent when held up to a light source.

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