sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep reddish-brown; Luster: Dull or waxy when raw; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Fracture: Conchoidal.
- Hardness
- 6
- Color
- Brick red to deep reddish-brown
- Luster
- Dull or waxy when raw
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep reddish-brown; Luster: Dull or waxy when raw; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Fracture: Conchoidal.
Formation & geological history
Formed primarily in sedimentary environments when silica-rich fluids permeate through volcanic ash or other sediments during the early stages of diagenesis. Its red color is derived from iron impurities.
Uses & applications
Commonly used in jewelry as cabochons, for lapidary work (tumbling and carving), as a decorative stone, and historically in various cultures as an ornamental gem.
Geological facts
Red Jasper has been used since antiquity, appearing in Minoan Crete and ancient Egyptian jewelry. It is often referred to as a 'nurturing stone' in metaphysical circles.
Field identification & locations
Identify in the field by its opaque reddish appearance, lack of graininess compared to sandstone, and its ability to scratch glass. It is commonly found in gravel pits, riverbeds, and in areas of volcanic activity.
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