sedimentary
Red Jasper
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91.
Formation & geological history
Formed by the precipitation of silica from volcanic fluids or in sedimentary deposits where iron oxides (hematite) are present. Often found in hydrothermal veins or as pebbles in river beds.
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative ornaments, and as a focus for crystal healing practices. Occasionally used for building facade accents.
Geological facts
Jasper is an opaque variety of chalcedony. The red color specifically comes from iron impurities. It has been a popular gemstone since ancient times, mentioned in various mythologies and historical texts as a stone of endurance.
Field identification & locations
Identify by its rich red color, extreme hardness (will scratch glass), and opaque nature. It is commonly found in India, Brazil, USA, and South Africa. Collectors look for pieces with interesting patterns or high polish.
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