sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed when fine silica-rich volcanic ash or sediments become saturated with iron oxides and undergo hydrothermal processing or lithification. Most specimens date back to the Proterozoic or Paleozoic eras.
Uses & applications
Used primarily in lapidary arts for jewelry, decorative carvings, cabochons, and as a popular collected specimen for its ornamental beauty.
Geological facts
The red color comes from high concentrations of iron. In ancient times, it was known as the 'rain bringer' and was frequently mentioned in biblical and Egyptian texts as a protective stone.
Field identification & locations
Identify by its opaque red color, smoothness when polished, and lack of transparency. Common in riverbeds or near volcanic deposits. Found globally, notably in India, Brazil, and the USA.
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