sedimentary
Blue Lace Agate
Cryptocrystalline Quartz (SiO2) with trace minerals
Hardness: 6.5-7.0 (Mohs scale); Color: Pale blue with white or darker blue bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Specific Gravity: 2.6-2.64
- Hardness
- 6
- Color
- Pale blue with white or darker blue bands
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Pale blue with white or darker blue bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Specific Gravity: 2.6-2.64
Formation & geological history
Formed in cavities of volcanic rocks or ancient lavas, where silica-rich groundwater deposited layers of chalcedony over millions of years. This specific variety is primarily associated with the Kalahari region.
Uses & applications
Extensively used in jewelry (cabochons, beads), decorative carvings, and as a popular stone for mineral collectors and metaphysical practitioners.
Geological facts
First discovered in the 1960s in Namibia by George Swanson. It is considered a rare variety of chalcedony due to its unique, delicate banding patterns that resemble lace.
Field identification & locations
Identified by its distinctive light blue color and intricate, wavy white banding. Found primarily in Namibia and South Africa. Collectors should look for high contrast in bands and lack of cracks.
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