mineral

Banded Agate

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs); Color: Brown, tan, and cream bands; Luster: Waxy to vitreous; Structure: Microcrystalline (trigonal); Cleavage: None; SG: 2.58-2.64

Hardness: 6
Color: Brown, tan, and cream bands
Luster: Waxy to vitreous

Identified May 18, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Brown, tan, and cream bands; Luster: Waxy to vitreous; Structure: Microcrystalline (trigonal); Cleavage: None; SG: 2.58-2.64

Formation & geological history

Forms in cavities of volcanic rocks or ancient lavas where silica-rich fluids deposit layers over time, often spanning millions of years.

Uses & applications

Commonly used in jewelry, lapidary arts as cabochons, decorative ornaments, and historically for precision mechanical bearings and burnishing tools.

Geological facts

The name 'Agate' comes from the Achates River in Sicily where it was first discovered. The distinct banding is caused by the rhythmic precipitation of silica.

Field identification & locations

Look for distinctive concentric or parallel banding and a waxy surface when broken. Found globally in volcanic regions like Brazil, India, and the Lake Superior region.