mineral

Banded Agate (Tumbled)

Silicon Dioxide (SiO2) - variety of Chalcedony

Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands (purple, white, reddish-brown); Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.64

Hardness: 6
Color: Multi-colored bands (purple, white, reddish-brown)
Luster: Vitreous to waxy

Identified April 4, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from groundwater into cavities (vesicles) of igneous rocks. The distinctive banding occurs as different layers of silica are deposited sequentially over long geological periods.

Uses & applications

Commonly used in jewelry (cabochons, beads), decorative ornaments, stone carvings, and as a popular specimen for metaphysical or spiritual collectors.

Geological facts

Agate is named after the Achates River in Sicily where it was first discovered by the ancient Greeks. No two agates are exactly alike due to the unique chemical conditions during their formation.

Field identification & locations

Identify in the field by checking for translucent layers, a conchoidal fracture pattern, and characteristic concentric or horizontal banding. It cannot be scratched by a steel knife.

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