sedimentary (primary) with artificial modification
Dyed and Metallic Coated Agate Geode
Silicon Dioxide (SiO2) with titanium/gold vapor deposition coating
Hardness: 7 (Mohs scale), Color: Artificial purple/gold iridescent, Luster: Vitreous to metallic, Crystal Structure: Hexagonal (microcrystalline/cryptocrystalline), Cleavage: None/Conchoidal fracture.
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Physical properties
Hardness: 7 (Mohs scale), Color: Artificial purple/gold iridescent, Luster: Vitreous to metallic, Crystal Structure: Hexagonal (microcrystalline/cryptocrystalline), Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed in volcanic or sedimentary cavities where silica-rich groundwater deposited layers of microcrystalline quartz over thousands of years. The specimen shown has been industrially dyed and heat-treated with a vapor-deposition coating (often called 'Aura' coating).
Uses & applications
Primarily used for decorative purposes, metaphysical collecting, giftware, and inexpensive jewelry components.
Geological facts
Natural agates are rarely this vibrant; the intense purple and metallic golden iridescence are created in a laboratory by bonding metal vapors to the surface of the natural quartz crystals. This process is known as PVD (Physical Vapor Deposition).
Field identification & locations
Identify in the field by looking for rounded, nodular rocks that feel lighter than expected; however, the colors shown here do not occur in nature. Collectors look for the 'druzy' (small crystal) interior. Common sources include Brazil and Uruguay.
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