sedimentary
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - stained microcrystalline quartz
Hardness: 6.5–7 (Mohs scale); Color: Electric blue (artificial); Luster: Vitreous/Waxy; Crystal Structure: Hexagonal (cryptocrystalline); Specific Gravity: 2.58–2.64
- Hardness
- 6
- Color
- Electric blue (artificial)
- Luster
- Vitreous/Waxy
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Electric blue (artificial); Luster: Vitreous/Waxy; Crystal Structure: Hexagonal (cryptocrystalline); Specific Gravity: 2.58–2.64
Formation & geological history
Formed as secondary deposits of silica in volcanic cavities or sedimentary veins. This specific specimen has undergone mechanical tumbling and artificial chemical dyeing to achieve its vibrant blue color.
Uses & applications
Primarily used for decorative purposes, metaphysical collecting (crystal healing), tumbled rock sets for children, and low-cost costume jewelry.
Geological facts
Natural agates of this intense 'electric' blue do not occur in nature; high-quality blue agates (like Blue Lace Agate) are much paler. Agate dyeing techniques date back to the ancient Romans.
Field identification & locations
Identify in the field by checking for banding and hardness; dyed specimens often show 'pooling' of color in microscopic cracks. These are ubiquitous in gift shops worldwide.
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