sedimentary
Red Jasper (Brecciated Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red with white/gray quartz veins; Luster: Dull to Vitreous; Crystal Structure: Hexagonal (Trigonal) microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red with white/gray quartz veins
- Luster
- Dull to Vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red with white/gray quartz veins; Luster: Dull to Vitreous; Crystal Structure: Hexagonal (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, with iron inclusions providing the red color. Often fractured and rehealed with quartz (brecciated).
Uses & applications
Used primarily for lapidary work, jewelry (cabochons and beads), decorative ornaments, and as a popular specimen for rock collectors and metaphysical use.
Geological facts
Jasper has been used as a gemstone since antiquity; it was known as the 'mother of all stones' in some ancient cultures and is frequently found in archaeological sites as seals or carvings.
Field identification & locations
Identify by its opacity, characteristic red color, and ability to scratch glass. It is commonly found in gravel beds, desert plains, and volcanic regions globally.
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