sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Deep red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Specific Gravity: 2.58-2.91; Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Deep red to brownish-red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Deep red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Specific Gravity: 2.58-2.91; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic or sedimentary environments. Its red color is derived from high concentrations of iron oxide (hematite) inclusions within the microcrystalline quartz structure.
Uses & applications
Commonly used in jewelry as cabochons, beads, and tumbled stones. Also used for ornamental carvings, paperweights, and as a decorative stone in landscaping.
Geological facts
Red Jasper was historically known as the 'stone of endurance' or 'supreme nurturer.' It is a favorite amongst lapidaries because it takes a very high polish and is durable enough for daily wear.
Field identification & locations
Identify in the field by its opaque red color, smoothness when water-worn, and inability to be scratched by a steel knife. It is frequently found in riverbeds, glacial deposits, and along beaches in Oregon, Idaho, and Michigan in the USA.
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