mineral
Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale); Color: White, grey, light blue; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64
- Hardness
- 6
- Color
- White, grey, light blue
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: White, grey, light blue; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.64
Formation & geological history
Formed primarily in volcanic and metamorphic rocks. It develops as silica-rich groundwater fills cavities (vesicles) in lava or rock, precipitating in layers over thousands of years.
Uses & applications
Used widely in lapidary arts, jewelry, decorative ornaments, and industrial uses like mortar and pestles due to its hardness and resistance to acids.
Geological facts
Agate was named by the Greek philosopher Theophrastus who discovered the stone along the shore line of the Achates River in Sicily. The banding is caused by periodic changes in the concentration of silica during deposition.
Field identification & locations
Identify by its waxy luster, translucency, and characteristic curved banding patterns. Often found as rounded nodules on beaches or in dry riverbeds.
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