Mineral
Agate
Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7; Color: Orange, brown, and white banded; Luster: Waxy to vitreous; Crystal structure: Cryptocrystalline; Cleavage: None; Specific gravity: 2.58-2.64
- Hardness
- 6
- Color
- Orange, brown, and white banded
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7; Color: Orange, brown, and white banded; Luster: Waxy to vitreous; Crystal structure: Cryptocrystalline; Cleavage: None; Specific gravity: 2.58-2.64
Formation & geological history
Forms in the cavities of volcanic and metamorphic rocks from silica-rich fluids over millions of years.
Uses & applications
Used in jewelry, decorative items, and lapidary arts.
Geological facts
Agate is a variety of chalcedony characterized by its fineness of grain and brightness of color. The bands are formed by rhythmic crystallization.
Field identification & locations
Identified by its distinctive banding, waxy luster, and hardness. Often found in riverbeds, beaches, and areas with past volcanic activity. Wetting the stone helps reveal its colors and patterns.
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