sedimentary
Jasper with Agate and Quartz Inclusions
Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate
Hardness: 6.5–7 on Mohs scale; Color: Multicolored with earthy reds, browns, and translucent whites; Luster: Waxy to vitreous; Crystal Structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6–2.9
- Hardness
- 6
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Multicolored with earthy reds, browns, and translucent whites; Luster: Waxy to vitreous; Crystal Structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6–2.9
Formation & geological history
Formed through the precipitation of silica-rich fluids within volcanic host rocks or sedimentary basins. Voids and fractures are filled over millions of years by microcrystalline quartz (jasper) and banded chalcedony (agate).
Uses & applications
Used primarily in lapidary arts for cabochons, jewelry making, and as a decorative specimen for collectors.
Geological facts
Jasper is often referred to as the 'Supreme Nurturer.' This specific specimen shows 'plumose' or 'mossy' textures where iron or manganese oxides have mineralized into the quartz matrix, creating unique organic patterns.
Field identification & locations
Identify in the field by its hardness (it will scratch glass), its opaque to translucent nature, and smooth, curved fracture surfaces. Found in abundance in the Western United States (Oregon, Idaho) and Brazil.
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