sedimentary
Jasper Agate
Silicon Dioxide (SiO2) - Chalcedony variety
Hardness: 6.5-7 on the Mohs scale, Color: Brown, white, and yellow mottled, Luster: Waxy to vitreous, Crystal structure: Microcrystalline quartz (trigonal), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.66
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 on the Mohs scale, Color: Brown, white, and yellow mottled, Luster: Waxy to vitreous, Crystal structure: Microcrystalline quartz (trigonal), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.66
Formation & geological history
Formed through the deposition of silica-rich groundwater in cavities of rocks or as sedimentary replacements, often during the Cenozoic era or earlier volcanic activity.
Uses & applications
Used in lapidary arts, decorative items, tumbled stones, jewelry making, and collected by rockhounds.
Geological facts
Jasper and agate often form in the same geological environments, creating beautiful hybrid stones where opaque jasper blends seamlessly into translucent chalcedony.
Field identification & locations
Can be identified by its conchoidal fracture, waxy luster, and mix of opaque and translucent zones. Commonly found in riverbeds, gravel bars, and areas with historical volcanic or sedimentary activity.
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