sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Deep red/brick red, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture)
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Deep red/brick red, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture)
Formation & geological history
Formed from the deposition of silica-rich fluids within cracks or volcanic ash, often associated with sedimentary or volcanic environments; dates back millions of years.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and carvings. Also used historically for seals, talismans, and as an ornamental stone.
Geological facts
Red jasper gets its vibrant color from iron inclusions (hematite). It has been known as the 'stone of endurance' in various historical cultures and was used by ancient Egyptians in amulets.
Field identification & locations
Identify in the field by its opaque deep red color and high hardness (it cannot be scratched by a steel knife). Commonly found in riverbeds and arid regions globally, including USA, Brazil, and India.
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