sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 Mohs; Color: Deep red to reddish-brown; Luster: Vitreous to waxy; Structure: Microcrystalline/cryptocrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep red to reddish-brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Deep red to reddish-brown; Luster: Vitreous to waxy; Structure: Microcrystalline/cryptocrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica from hydrothermal solutions or in sedimentary environments where volcanic ash or fine-grained sediments are permeated by silica-rich fluids, often during the Precambrian to Paleozoic eras.
Uses & applications
Extensively used for lapidary work, decorative carvings, jewelry (cabochons), and as a healing stone in metaphysical communities.
Geological facts
The red color is caused by the inclusion of iron oxide (hematite). It has been used since antiquity for royal seals and was known in many ancient cultures as the 'bringer of courage'.
Field identification & locations
Identify by its smooth, flint-like texture, opaque appearance, and resistance to scratching by a steel knife. Commonly found in riverbeds, glacial tills, and coastal beaches, particularly in areas like the Lake Superior region or South Africa.
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