sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Deep 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
- Deep red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Deep 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 from silica-rich fluids depositing in cracks or cavities in sedimentary or metamorphic environments, with its characteristic red color coming from high iron content. It is often found in prehistoric volcanic ash beds.
Uses & applications
Primarily used in jewelry, lapidary arts, and stone carvings. Historically used for making tools like scrapers and arrowheads due to its conchoidal fracture.
Geological facts
Red Jasper has been used since antiquity; it was known as the 'rain bringer' in some indigenous cultures and was frequently used in the seals of ancient Babylon and Egypt.
Field identification & locations
Identify by its opaque red color and high hardness (it cannot be scratched by a steel knife). Commonly found in river beds, beaches, and desert areas worldwide.
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