sedimentary
Banded Agate (Tumbled)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale); Color: Variegated bands of pink, white, gray, and brown; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None; SG: 2.58-2.64.
- Hardness
- 6
- Color
- Variegated bands of pink, white, gray, and brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Variegated bands of pink, white, gray, and brown; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None; SG: 2.58-2.64.
Formation & geological history
Formed as a secondary mineral in volcanic rock cavities (vesicles) or sedimentary fissures. Silicate-rich groundwater deposits layers of rhythmic crystallization over thousands of years.
Uses & applications
Used primarily in jewelry (beads, cabochons), ornamental decoration, holistic healing practices, and industrial use in precision mortars and pestles.
Geological facts
Agate is named after the Achates River (now the Dirillo) in Sicily. The distinct banding is caused by variations in the impurity concentration during the wall-inward growth process.
Field identification & locations
Identified by its waxy luster and unique parallel banding. Tumbled specimens feel very smooth and are significantly harder than glass. Common in Brazil, India, and the Lake Superior region.
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