Rock Identifier
Blue Lace Agate (Cryptocrystalline variety of Quartz (SiO2)) — mineral
mineral

Blue Lace Agate

Cryptocrystalline variety of Quartz (SiO2)

Hardness: 6.5-7 (Mohs); Color: Pale blue with white or darker blue banding; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.60 to 2.64.

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

Hardness: 6.5-7 (Mohs); Color: Pale blue with white or darker blue banding; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.60 to 2.64.

Formation & geological history

Formed in volcanic cavities or veins where silica-rich groundwater deposits layers of chalcedony. This specific variety is primarily associated with the Precambrian period in Southern African deposits.

Uses & applications

Extensively used in jewelry (cabochons, beads), decorative carvings, and as a popular metaphysical or healing stone. It is highly valued by collectors for its unique banding patterns.

Geological facts

First discovered in Namibia in the early 1960s by George Swanson. It is considered a subset of chalcedony specifically defined by its intricate blue lace-like banding patterns.

Field identification & locations

Identify in the field by its distinct light blue layers and translucency when held to light. Primarily sourced from South Africa and Namibia. Field collectors should look for distinctive banding which sets it apart from solid chalcedony.

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