mineral

Blue Lace Agate (Chert/Chalcedony)

Silicon dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Pale blue, grey-white; Luster: Waxy to vitreous; Crystal Structure: Cryptocrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.64

Hardness: 6
Color: Pale blue, grey-white
Luster: Waxy to vitreous

Identified June 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from groundwater in cavities (vesicles) within igneous rocks, particularly volcanic lavas. Most blue lace agate specifically comes from the Karasburg region of Namibia.

Uses & applications

Primarily used for lapidary purposes, including jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal healing and metaphysical collections.

Geological facts

The banding in Agate is caused by periodic changes in the concentration of silica and impurities during formation. It is one of the most popular varieties of chalcedony due to its delicate coloration.

Field identification & locations

Identify in the field by its waxy luster, conchoidal fracture (chip patterns like glass), and distinctive translucent blue-grey banding. It is commonly found in areas of ancient volcanic activity.

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Banded Gneiss (River Rock/Pebble)

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