sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water containing iron oxides, often in sedimentary or volcanic environments. Found in ancient ocean beds and areas with high hydrothermal activity.
Uses & applications
Commonly used in lapidary work, jewelry (beads, cabochons), ornamental sculpture, and as architectural accents or stone flooring in luxury settings.
Geological facts
Red Jasper has been used since antiquity for ornaments and was known as a 'warrior's stone' in many cultures. It gets its vibrant red color specifically from hematite inclusions.
Field identification & locations
Identify by its rich red color, opaque transparency, and smooth, shell-like (conchoidal) fracture surfaces. Commonly found in South Africa, Brazil, India, and the southwestern United States.
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