mineral

Banded Agate (specifically Botswana Agate appearance)

Silicon Dioxide (SiO2) - variety of Chalcedony

Hardness: 6.5-7 on Mohs scale; Color: Gray, pink, brown, and white bands; Luster: Waxy to vitreous; Crystal structure: Hexagonal (trigonal) microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.60-2.65

Hardness: 6
Color: Gray, pink, brown, and white bands
Luster: Waxy to vitreous

Identified March 26, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from groundwater in the cavities of igneous rocks such as basalt. The banding is created by successive layers of different mineral concentrations over millions of years, commonly dating back to the Mesoproterozoic or Cenozoic eras.

Uses & applications

Used primarily in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for collectors. In industry, due to its hardness and acid resistance, it has been used for precision pendulums and mortars and pestles.

Geological facts

Banded agates have been used as amulets for over 3,000 years, notably in Ancient Babylon. Botswana Agate is often referred to as 'The Sunset Stone' because its colors mimic the sky during dusk. It is valued for its exceptionally fine, tight banding compared to other agates.

Field identification & locations

Identify in the field by its distinct parallel banding patterns, translucency when held to light, and waxy surface texture. Commonly found in volcanic landscapes or riverbeds. Collectors should look for high contrast in banding and lack of internal fractures.

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