mineral
Blue Lace Agate Geode Nodules
Chalcedony (cryptocrystalline Quartz, SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Light blue with white or brown banding; Luster: Vitreous to waxy; Crystal structure: Trigonal/Monoclinic; Cleavage: None; Specific gravity: 2.58–2.64
- Hardness
- 6
- Color
- Light blue with white or brown banding
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Light blue with white or brown banding; Luster: Vitreous to waxy; Crystal structure: Trigonal/Monoclinic; Cleavage: None; Specific gravity: 2.58–2.64
Formation & geological history
Formed through the deposition of silica from groundwater in the cavities of igneous rocks (volcanic vesicles). These layers often take millions of years to build up, reflecting changes in water chemistry during the process.
Uses & applications
Primarily used for ornamental purposes, lapidary arts, jewelry (cabochons and beads), and as metaphysical healing stones.
Geological facts
The specific light blue color and banding of Blue Lace Agate is often attributed to the kehadiran of copper or the scattering of light by the microstructure. It was first discovered in Namibia in the 1960s.
Field identification & locations
Identify by its distinctive concentric, wavy color bands and its exterior rough 'husk'. It is most famously found in the Karas region of Namibia. In the field, look for rounded nodules with a weathered, whitish-brown exterior that reveal banding when cracked or sliced.
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