mineral
Blue Lace Agate (Chert/Chalcedony)
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale); Color: Pale blue, grey-white; Luster: Waxy to vitreous; Crystal Structure: Cryptocrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.64
- Hardness
- 6
- Color
- Pale blue, grey-white
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Pale blue, grey-white; Luster: Waxy to vitreous; Crystal Structure: Cryptocrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.64
Formation & geological history
Formed through the deposition of silica from groundwater in cavities (vesicles) within igneous rocks, particularly volcanic lavas. Most blue lace agate specifically comes from the Karasburg region of Namibia.
Uses & applications
Primarily used for lapidary purposes, including jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal healing and metaphysical collections.
Geological facts
The banding in Agate is caused by periodic changes in the concentration of silica and impurities during formation. It is one of the most popular varieties of chalcedony due to its delicate coloration.
Field identification & locations
Identify in the field by its waxy luster, conchoidal fracture (chip patterns like glass), and distinctive translucent blue-grey banding. It is commonly found in areas of ancient volcanic activity.
