sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Formed when silica-rich fluids settle in sedimentary environments or volcanic ash deposits, with high iron oxide (hematite) content providing the red pigment throughout the crystallization process.
Uses & applications
Primarily used for lapidary arts, jewelry (cabochons, beads), decorative carvings, and as a popular tumbled stone for collectors and metaphysical practices.
Geological facts
Red Jasper was known as the 'stone of endurance' in ancient times and has been used since antiquity for royal seals and amulets. It is an opaque variety of chalcedony.
Field identification & locations
Identify by its deep red color, high hardness (cannot be scratched by a steel blade), and smooth, conchoidal fracture. Commonly found in India, Brazil, USA (Southwest), and South Africa.
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