sedimentary

Blue Lace Agate

Silicon Dioxide (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: 2.58–2.64

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

Identified March 28, 2026More sedimentary →

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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: 2.58–2.64

Formation & geological history

Formed through the deposition of silica from groundwater in the cavities of igneous rocks. Most significant deposits occurred during the volcanic activities of the Tertiary period (roughly 25–50 million years ago).

Uses & applications

Used primarily for ornamental jewelry, cabochons, carvings, and as a metaphysical healing stone. Also used in precision instruments due to its toughness.

Geological facts

First discovered in Namibia by George Swanson in the 1960s. It is a variety of Chalcedony and is unique for its delicate, lace-like patterns produced by layered mineral impurities.

Field identification & locations

Identify by its distinct banding and 'periwinkle' blue hue. It is mostly found in Namibia, South Africa, and Brazil. In the field, look for nodules with a waxy exterior that reveal blue banding when fractured.