mineral

Blue Lace Agate (Banded Chalcedony)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Hardness: 6.5-7 on Mohs scale; Color: Light blue with white or darker blue banding; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.64

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

Identified March 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed in volcanic environments where silica-rich groundwater fills cavities (vugs) in basaltic rock. The distinct bands are created by cyclic deposition of silica and trace minerals like copper or manganese over millions of years.

Uses & applications

Primarily used in jewelry as cabochons, beads, and carvings. Also popular in the metaphysical community and for high-end decorative lapidary work.

Geological facts

First discovered in Namibia by George Swanson in the 1960s; it is one of the rarest varieties of agate because true 'Blue Lace' with precise banding is geographically limited.

Field identification & locations

Identify by its characteristic 'lace-like' wavy bands and soft blue hue. Look for a waxy texture and translucency when held to light. Major deposits are found in Namibia and South Africa.

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