mineral
Red Agate Sphere (or Banded Jasper/Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Hardness: 6.5-7 on Mohs scale. Color: Vibrant red swirls mixed with translucent white/grey chalcedony. Luster: Vitreous to waxy when polished. Crystal Structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None, exhibits conchoidal fracture.
- Hardness
- 6
- Luster
- Vitreous to waxy when polished
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Vibrant red swirls mixed with translucent white/grey chalcedony. Luster: Vitreous to waxy when polished. Crystal Structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None, exhibits conchoidal fracture.
Formation & geological history
Formed in volcanic rocks or altered metamorphic settings through the deposition of silica from hydrothermal fluids filling cavities (vugs) or fractures over millions of years. Red coloring is typically due to iron oxide inclusions.
Uses & applications
Used primarily as decorative polished spheres, pocket stones, lapidary art, polished collectibles, crystal healing/metaphysical practices, and jewelry.
Geological facts
Polished spheres showcase the intricate swirling and banding patterns created as different layers of silica and trace minerals precipitate at varying rates over time. Agate is named after the Achates River in Sicily where it was historically discovered.
Field identification & locations
Identify by its polished spherical shape, distinct swirl patterns of translucent chalcedony and opaque red jasper/iron-rich quartz, high harness (will scratch glass), and lack of cleavage. Commonly mined in Brazil, Madagascar, Mexico, and the USA.
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