sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Dull to waxy; 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 waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Dull to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into sedimentary or volcanic rock beds. The distinct red color is caused by iron oxide (Hematite) inclusions during the solidification process. It can be found in a variety of geological ages from Precambrian to Cenozoic.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and carvings. Historically used for seals and amulets. Also used as decorative stone in gardens and aquariums.
Geological facts
Jasper has been a favorite gemstone since antiquity; it is mentioned in the Bible and was highly prized by the ancient Egyptians and Babylonians. Ancient civilizations often associated it with strength and vitality.
Field identification & locations
Identify by its opaque nature, deep red color, and the fact that it cannot be scratched by a steel knife. Commonly found in riverbeds, deserts, or coastal areas where erosion has exposed larger deposits.
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