sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Brick red to deep maroon, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to deep maroon, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from hydrothermal solutions or volcanic ash in sedimentary environments, often containing iron impurities that provide the red hue.
Uses & applications
Commonly used in jewelry cabinetmaking, decorative ornaments, lapidary arts, and as a popular pocket stone for collectors.
Geological facts
Jasper has been used as a gemstone since antiquity; it is mentioned in several ancient sources and was often used in Babylonian cylinder seals.
Field identification & locations
Identify by its opaque nature (unlike translucent carnelian), its dull to waxy luster when unpolished, and its extreme hardness. Found worldwide in places like India, Brazil, and the USA.
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