sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; 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); Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica in hydrothermal veins or as a chemical sedimentary rock. Its vibrant red color comes from high concentrations of iron oxide (hematite) included during formation.
Uses & applications
Used primarily for ornamental jewelry, decorative carvings, lapidary work, and spiritual meditation practices.
Geological facts
Jasper has been used by ancient civilizations for seal stones and amulets for thousands of years; it is mentioned in the Bible and was known as the 'rain bringer' in some Native American cultures.
Field identification & locations
Identify by its opaque red color and high hardness; it cannot be scratched by a steel knife. Commonly found in South Africa, Brazil, India, and the southwestern United States.
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