mineral
Agate
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs); Color: Multi-colored bands (brown, white, green); Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64
- Hardness
- 6
- Color
- Multi-colored bands (brown, white, green)
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Multi-colored bands (brown, white, green); Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64
Formation & geological history
Formed in volcanic rock cavities (vesicles) or metamorphic rocks where silica-rich groundwater deposits layers of chalcedony over thousands of years.
Uses & applications
Used primarily in lapidary arts, jewelry (cabochons), precision weighs, and as a collector's specimen.
Geological facts
Agate is a variety of chalcedony characterized by its fineness of grain and brightness of color. It is the official gemstone of several US states including Kentucky and Tennessee.
Field identification & locations
Identify by its translucent nature when held to light and characteristic banding or 'eye' patterns. Commonly found in riverbeds and volcanic regions worldwide.
