mineral

Blue Lace Agate (often dyed)

Silicon dioxide (SiO2) - variety of chalcedony

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Pale blue to deep blue with white or light gray banding; Luster: Waxy to vitreous; Crystal Structure: Trigonal (cryptocrystalline); Specific Gravity: 2.6-2.65.

Hardness: 6
Color: Pale blue to deep blue with white or light gray banding
Luster: Waxy to vitreous

Identified May 15, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Pale blue to deep blue with white or light gray banding; Luster: Waxy to vitreous; Crystal Structure: Trigonal (cryptocrystalline); Specific Gravity: 2.6-2.65.

Formation & geological history

Formed through the deposition of silica from groundwater in cavities of igneous rocks such as basalt. The banding represents different layers of crystallization. Blue agate is often naturally pale, while vibrant blue specimens (like the one pictured) are frequently color-enhanced through dyeing.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collectible stone for crystal healing and metaphysical enthusiasts.

Geological facts

Natural blue lace agate was originally discovered in Namibia. It is a form of chalcedony, which is a microcrystalline variety of quartz. Most intensely blue tumble stones found in gift shops are dyed to enhance their eye appeal.

Field identification & locations

Identify in the field by its distinctive wavy banding patterns and extreme hardness (cannot be scratched by a steel knife). Commonly found in volcanic regions of Brazil, Uruguay, and Namibia.