mineral

Banded Agate

Silicon Dioxide (SiO2) - Variety Agate

Hardness: 6.5-7 on Mohs scale; Color: Red, white, and tan bands; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.64

Hardness: 6
Color: Red, white, and tan bands
Luster: Vitreous to waxy

Identified July 6, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in volcanic and metamorphic rocks through the deposition of silica from groundwater in rock cavities or veins. This process often occurs over millions of years, creating beautiful bands.

Uses & applications

Used extensively in jewelry as cabochons, for ornamental carvings, in decorative items, and historically for precision instruments like mortars and pestles due to its hardness.

Geological facts

The name 'Agate' comes from the Achates River in Sicily, where agates were first discovered in ancient times. The banding layers can sometimes be so thin that thousands sit within a single inch.

Field identification & locations

Identify in the field by looking for translucent, banded stones with a waxy luster and shell-like fracture marks. Commonly found in riverbeds and areas with ancient volcanic activity.