Rock Identifier
Banded Agate (specifically Botswana Agate or Water-line Agate) (Chalcedony (cryptocrystalline variety of Quartz), SiO2) — mineral
mineral

Banded Agate (specifically Botswana Agate or Water-line Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Hardness: 6.5–7 on Mohs scale; Color: Swirling bands of grey, brown, white, and subtle pink; Luster: Waxy to vitreous; Crystal Structure: Trigonal/Monoclinic (microscopic); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.60–2.65

Hardness
6
Color
Swirling bands of grey, brown, white, and subtle pink
Luster
Waxy to vitreous
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Physical properties

Hardness: 6.5–7 on Mohs scale; Color: Swirling bands of grey, brown, white, and subtle pink; Luster: Waxy to vitreous; Crystal Structure: Trigonal/Monoclinic (microscopic); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.60–2.65

Formation & geological history

Formed through the deposition of silica from groundwater into cavities (vesicles) in volcanic rock. The distinct bands represent different stages of mineral deposition over thousands of years. Natural Botswana agates are nearly 187 million years old.

Uses & applications

Predominantly used in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock collectors and metaphysical practitioners.

Geological facts

Agate is named after the Achates River in Sicily. Botswana agate is renowned for its very fine, hair-thin banding and exceptionally smooth texture compared to other agate varieties.

Field identification & locations

Identify by looking for rhythmic, parallel banding and a waxy surface. In the field, look for nodules with a rough exterior but translucent interiors when chipped. Commonly found in riverbeds or volcanic regions of Botswana, Brazil, and the Lake Superior region of the US.

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