mineral
Blue Lace Agate (Tumbled)
Silicon Dioxide (SiO2) with trace minerals
Hardness: 6.5-7 (Mohs scale); Color: Pale blue with white or darker blue banding; Luster: Vitreous to waxy; Structure: Hexagonal (Cryptocrystalline); Cleavage: None; SG: 2.60-2.65
- Hardness
- 6
- Color
- Pale blue with white or darker blue banding
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Pale blue with white or darker blue banding; Luster: Vitreous to waxy; Structure: Hexagonal (Cryptocrystalline); Cleavage: None; SG: 2.60-2.65
Formation & geological history
Formed in volcanic rock cavities (vugs) through the deposition of silica from groundwater. The blue color is often attributed to the scattering of light by microscopic inclusions or 'Tyndall scattering'.
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative carvings, and as a popular gemstone for collectors and metaphysical practices.
Geological facts
Most high-quality Blue Lace Agate was originally sourced from the farm Ysterputs in Namibia. It belongs to the chalcedony family, specifically the banded variety known as agate.
Field identification & locations
Identify by its distinctive delicate blue and white bands. In the field, look for nodules in basalt or rhyolite. For collectors, clarity and distinctness of the lace pattern drive value.
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