sedimentary
Red Agate Sphere
Chalcedony (SiO2 with iron oxide inclusions)
Hardness: 6.5-7 Mohs; Color: Bright red, orange, and white bands/swirls; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Specific Gravity: 2.58-2.64
- Hardness
- 6
- Color
- Bright red, orange, and white bands/swirls
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Bright red, orange, and white bands/swirls; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Specific Gravity: 2.58-2.64
Formation & geological history
Formed in cavities of volcanic rock or ancient sedimentary deposits through the deposition of silica from groundwater; these specific colors are often enhanced or created by heat treatment and dyeing of natural chalcedony.
Uses & applications
Home decor (spheres), jewelry, lapidary arts, and metaphysical practices.
Geological facts
Agate is named after the Achates River in Sicily. Red agate is specifically associated with fire and protection in various historical cultures. While natural red agate exists (Carnelian), many vibrant spheres like this are dyed to produce high contrast patterns.
Field identification & locations
Identify by its characteristic banding or 'swirled' look and high hardness (it cannot be scratched by a steel knife). Common sources include Brazil, Uruguay, and India.
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