gemstone
Fairburn Agate
SiO2 (Cryptocrystalline Quartz)
AI-generated identification · may be incorrectHardness 7 on the Mohs scale; displays distinct concentric banding in red, yellow, and white colors; waxy to vitreous luster with a microcrystalline structure.
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Physical properties
Hardness 7 on the Mohs scale; displays distinct concentric banding in red, yellow, and white colors; waxy to vitreous luster with a microcrystalline structure.
Formation & geological history
Formed through the deposition of silica-rich groundwater in cavities of sedimentary and volcanic rocks over millions of years during the Mesozoic and Cenozoic eras.
Uses & applications
Prized by lapidaries and collectors for use in high-end jewelry and display specimens.
Geological facts
Named after the town of Fairburn, South Dakota, this agate is famous for its striking fortification patterns and is the official state gemstone of South Dakota.
Field identification & locations
Identified by its bold, angular 'fortification' banding and typically found in the Black Hills region of South Dakota and parts of Nebraska.
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