sedimentary
Jasper and Chalcedony
Silicon Dioxide (SiO2) microcrystalline quartz
Hardness of 6.5 to 7 on the Mohs scale, waxy luster, opaque to translucent, conchoidal fracture, specific gravity of 2.6 to 2.7, displays distinct red and white banding or zones.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy luster, opaque to translucent, conchoidal fracture, specific gravity of 2.6 to 2.7, displays distinct red and white banding or zones.
Formation & geological history
Formed via the precipitation of silica-rich fluids within rock cavities, fractures, or sedimentary environments over millions of years.
Uses & applications
Used in lapidary arts, ornamental carvings, jewelry, and by mineral collectors.
Geological facts
Red coloration in jasper is typically due to iron oxide impurities incorporated during its formation process.
Field identification & locations
Can be identified in the field by its high hardness, conchoidal fracture, and characteristic waxy luster. Frequently found in regions with volcanic activity or ancient sedimentary deposits.
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