sedimentary
Red Jasper with Hematite
Impure Microcrystalline Quartz (SiO2) with Hematite (Fe2O3)
Hardness: 6.5-7 (Mohs scale); Color: Red, brown, and black; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Red, brown, and black
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Red, brown, and black; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of silica-rich micro-sediments or from volcanic ash deposition. The red color is caused by iron oxidation, while black areas are concentrated hematite inclusions.
Uses & applications
Commonly used for lapidary work including cabochons, beads, decorative carvings, and as a pocket stone for collectors.
Geological facts
Jasper is known as the 'supreme nurturer.' The red variety gets its hue specifically from high iron content. It has been used for seals and amulets since ancient times.
Field identification & locations
Identified by its opacity, characteristic red and black banding or mottling, and its ability to scratch glass. Found frequently in riverbeds or gravel pits in the Lake Superior region and Southwestern US.
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