sedimentary
Red Jasper
Jasper (Silica/Silicon Dioxide, SiO2 plus iron inclusions)
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Dull to vitreous, Crystal Structure: Microcrystalline (trigonal), 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: Dull to vitreous, Crystal Structure: Microcrystalline (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the process of silica-rich fluid deposition within volcanic or sedimentary environments. Its red color is derived from iron (hematite) inclusions incorporated during the cooling or transformation of the host rock over millions of years.
Uses & applications
Extensively used for cabochons, jewelry, decorative carvings, and lapidary work. Historically used for making tools and amulets.
Geological facts
Ancient Egyptians associated red jasper with the blood of Isis and used it for protective amulets. It is a variety of chalcedony that is specifically opaque rather than translucent.
Field identification & locations
Identify by its deep red color, dull waxy luster on unpolished surfaces, and extreme hardness (it will scratch glass). Commonly found in riverbeds and desert environments in regions like India, Brazil, and the Southwestern USA.
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