mineral
Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
Hardness: 6.5–7 on Mohs scale; Color: Pinkish-white with concentric banding; Luster: Waxy to vitreous; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.64.
- Hardness
- 6
- Color
- Pinkish-white with concentric banding
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Pinkish-white with concentric banding; Luster: Waxy to vitreous; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.64.
Formation & geological history
Formed in cavities (vesicles) of volcanic rocks or ancient lava flows where silica-rich groundwater percolates and deposits layers of microcrystalline quartz over time.
Uses & applications
Used primarily in jewelry (cabochons), ornamental carvings, as well as industrial laboratory equipment like mortars and pestles due to its hardness and chemical resistance.
Geological facts
Agate is named after the Achates River (now Dirillo River) in Sicily. It is often found as nodules within volcanic host rocks and is known for its incredible variety of patterns and colors.
Field identification & locations
Identify in the field by its characteristic waxy luster and translucent banding when held to light. Common in lake shores (like Lake Superior), riverbeds, and volcanic regions.
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Green Apatite on Albite
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Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
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