mineral
Banded Agate
Chalcedony (Silicon Dioxide, SiO2)
AI-generated identification · may be incorrectHardness: 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
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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.
