sedimentary
Blue Lace Agate
Agate (Variety of Chalcedony, SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Pale blue with white or darker blue bands; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.60-2.65
- Hardness
- 6
- Color
- Pale blue with white or darker blue bands
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Pale blue with white or darker blue bands; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.60-2.65
Formation & geological history
Forms primarily in volcanic rock cavities or ancient hydrothermal veins where silica-rich groundwater deposits layers of chalcedony over time, creating distinctive banding patterns.
Uses & applications
Used extensively in jewelry for cabochons, beads, and carvings. Also popular in metaphysical circles and as a decorative collector's stone.
Geological facts
The most famous and high-quality specimens come from the Ysterputs mine in Namibia. It was first discovered by George Swanson in the early 1960s.
Field identification & locations
Identify by its unique sky-blue color and delicate, wavy white lace-like banding. It is often found as nodules in volcanic host rocks. Collectors should look for high translucency and clear, defined banding.
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