mineral

Blue Lace Agate (Variety of Chalcedony)

Silicon Dioxide (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Pale blue with white or darker blue banding; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.64

Hardness: 6
Color: Pale blue with white or darker blue banding
Luster: Vitreous to waxy

Identified March 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed in volcanic rock cavities (amygdules) when silica-rich groundwater percolates through cooling lava. This specific variety is primarily associated with the Precambrian age in certain regions of Southern Africa.

Uses & applications

Predominantly used in jewelry (cabochons, beads), ornamental carvings, and as a popular specimen for metaphysical collectors due to its soothing appearance.

Geological facts

First discovered in Namibia in the 1960s by George Swanson. It is considered one of the rarest varieties of agate because the primary source in Namibia has faced intermittent production and limited supply.

Field identification & locations

Identify by its distinct concentric or wavy blue-and-white banding and its translucent nature when held to light. It is commonly found in Namibia and South Africa. Collectors look for high 'lace' definition and deep blue hues.

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