sedimentary
Chalcedony (Jasper/Agate mix)
Quartz (microcrystalline SiO2)
Hardness: 6.5-7 Mohs; Color: Honey brown, tan, and orange with iron staining; Luster: Waxy to vitreous; Structure: Cryptocrystalline; Cleavage: None; Fracture: Conchoidal.
- Hardness
- 6
- Color
- Honey brown, tan, and orange with iron staining
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Honey brown, tan, and orange with iron staining; Luster: Waxy to vitreous; Structure: Cryptocrystalline; Cleavage: None; Fracture: Conchoidal.
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic cavities or sedimentary pockets. This specimen likely weathered out of a host rock and was smoothed by water transport.
Uses & applications
Used for lapidary work, jewelry, tumbling, and as a decorative specimen for collectors.
Geological facts
This specimen shows significant iron oxide staining which creates its 'honey' color. Large deposits of similar river-worn chalcedony are common in the Pacific Northwest and the American Southwest.
Field identification & locations
Identify in the field by its waxy appearance, conchoidal fracture (chip marks that look like shell curves), and high hardness—it will scratch steel but not be scratched by it.
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