sedimentary

Banded Agate (Silk Agate or Maligano Jasper variant)

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

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

Identified June 3, 2026More sedimentary →

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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.