mineral

Blue Lace Agate (Banded Chalcedony)

Silicon Dioxide (SiO₂)

Hardness: 6.5–7 on the Mohs scale. Color: Pale blue with white or wavy bands. Luster: Vitreous to waxy. Crystal Structure: Trigonal (cryptocrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.60–2.65.

Hardness: 6
Color: Pale blue with white or wavy bands
Luster: Vitreous to waxy

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from groundwater in the cavities (vesicles) of igneous rocks, such as basalt. As layers of silica precipitate over time, the characteristic banding develops. Deposits can range from millions to hundreds of millions of years old.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for metaphysical collectors due to its calming appearance. In industry, chalcedony is sometimes used for precision bearings or mortars and pestles because of its hardness.

Geological facts

First discovered in Namibia in the 1960s, it remains one of the rarest varieties of agate. While agates are found worldwide, the specific 'Blue Lace' pattern with high translucency is globally famous and highly sought after by lapidary artists.

Field identification & locations

Identify in the field by its distinct blue-and-white 'lace' wavy banding and its inability to be scratched by a steel knife. It is most commonly found in Namibia, but smaller occurrences appear in South Africa, Brazil, and the USA. Collectors look for high translucency and sharp, distinct banding.

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