Mineral (variety of Chalcedony/Quartz)
Red Jasper
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
Hardness: 6.5–7 on Mohs scale; Color: Deep Brick Red to Reddish-Brown; Luster: Vitreous to Waxy (dull when unpolished); Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Deep Brick Red to Reddish-Brown
- Luster
- Vitreous to Waxy (dull when unpolished)
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Deep Brick Red to Reddish-Brown; Luster: Vitreous to Waxy (dull when unpolished); Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58–2.91
Formation & geological history
Formed through the deposition of silica from hydrothermal solutions into volcanic ash or sediment, with iron oxides leaching into the structure to provide the red coloration. It is found in geological settings ranging from Precambrian to recent periods.
Uses & applications
Commonly used in lapidary for polishing, cabochons, beads for jewelry (bracelets and necklaces), and as a decorative stone in mosaics or small carvings. It is also highly popular in the metaphysical and rock collecting communities.
Geological facts
Red Jasper has been used since antiquity; it was known as the 'rain-bringer' in some Native American traditions and was frequently used in ancient Egypt for amulets and scarabs. Because it is an opaque variety of chalcedony, it is distinguished from carnelian by its lack of translucency.
Field identification & locations
Identify in the field by its rich red color, complete opacity (light will not pass through the edges), and extreme hardness (it will scratch glass). Common locations include South Africa, Brazil, India, Australia, and the Southwest United States (especially Arizona and Utah).
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Mineral (Variety of Chalcedony/Quartz)
Red Jasper
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
Mineral (variety of Chalcedony/Quartz)
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Brecciated Jasper
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