mineral
Banded Agate (Dyed)
Silicon Dioxide (SiO2) with impurities
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale; Color: Multi-colored bands (magenta/pink in this specimen are likely dyed); Luster: Vitreous to waxy; Structure: Cryptocrystalline quartz; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.64.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands (magenta/pink in this specimen are likely dyed); Luster: Vitreous to waxy; Structure: Cryptocrystalline quartz; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.64.
Formation & geological history
Formed primarily in volcanic and metamorphic rocks. Created when silica-rich groundwater fills cavities (vesicles) in igneous rocks, depositing layers of microcrystalline quartz over thousands of years.
Uses & applications
Commonly used in jewelry, ornamental carvings, tumbled stones for collectors, and historically for precision bearings and mortars/pestles due to its hardness.
Geological facts
The vibrant pink and magenta bands in this specific tumbled stone are likely the result of artificial dyeing, a common practice for agate to enhance its natural banding. Agate was one of the first materials used by humans for ornament and protection in ancient civilizations.
Field identification & locations
Identified by its characteristic concentric or parallel banding and translucent nature. Natural agates are found worldwide, notably in Brazil, Uruguay, and the United States (Lake Superior region).
