mineral

Banded Agate

Chalcedony (Silicon Dioxide, SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Red, orange, and white bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64.

Hardness: 6
Color: Red, orange, and white bands
Luster: Waxy to vitreous

Identified June 25, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Red, orange, and white bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64.

Formation & geological history

Formed in cavities within volcanic or metamorphic rocks where silica-rich groundwater deposited layers of microcrystalline quartz over thousands of years. Often associated with ancient basaltic gas bubbles (vesicles).

Uses & applications

Primarily used in jewelry, bead making, ornamental carvings, and as therapeutic 'worry stones' or for display in collections.

Geological facts

Agate is named after the Achates River in Sicily where it was first discovered. The banding represents rhythmic precipitation of silica. Historically, it was used for amulets and seals.

Field identification & locations

Identify by the characteristic concentric or parallel banding and translucent quality. Commonly found in Brazil, India, Uruguay, and Lake Superior (USA). For collectors, look for high contrast in bands and lack of fractures.