sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Deep brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9
- Hardness
- 6
- Color
- Deep brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, typically undergoing diagenesis. The red color is caused by the presence of hematite/iron oxide.
Uses & applications
Commonly used for ornamental carvings, jewelry (cabochons), tumbled stones, and as a healing stone in spiritual practices.
Geological facts
Jasper is an opaque variety of chalcedony. It has been used since ancient times for seals, talismans, and decorative architecture. It was once called the 'supreme nurturer' in ancient cultures.
Field identification & locations
Identify by its rich red color, extreme hardness (won't be scratched by a steel blade), and smooth, waxy fracture surface. It is commonly found in riverbeds and arid regions globally, including India, Brazil, and the Southwestern US.
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