mineral
Blue Lace Agate (often dyed)
Silicon dioxide (SiO2) - variety of chalcedony
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
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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.
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