sedimentary
Banded Agate (Silk Agate or Maligano Jasper variant)
Silicon Dioxide (SiO2)
Hardness: 6.5-7 (Mohs); Color: Multi-colored bands (brown, beige, grey, green); Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None
- Hardness
- 6
- Color
- Multi-colored bands (brown, beige, grey, green)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Multi-colored bands (brown, beige, grey, green); Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None
Formation & geological history
Formed in volcanic cavities or sedimentary veins through the deposition of silica from groundwater. The bands represent different rhythmic stages of mineral deposition.
Uses & applications
Primarily used for decorative purposes, jewelry (beads, cabochons), and lapidary art.
Geological facts
Agate belongs to the chalcedony family. The distinct swirling bands are often compared to silk or topographic maps, leading to the trade name 'Silk Agate'.
Field identification & locations
Identify by its waxy luster, variety of colors in parallel or concentric bands, and high hardness (it can scratch glass). Commonly found in volcanic regions of Brazil, Mexico, and Indonesia.
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