sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
Hardness: 6.5–7 on Mohs scale; Color: Deep Brick Red; Luster: Dull to Vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Deep Brick Red
- Luster
- Dull to Vitreous
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Deep Brick Red; Luster: Dull to Vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58–2.91
Formation & geological history
Formed through the deposition of silica from hydrothermal solutions or volcanic ash, which then solidifies into a microcrystalline quartz. The red color comes from high concentrations of iron oxide (hematite) during formation.
Uses & applications
Used primarily as a gemstone for jewelry (cabochons, beads), decorative carvings, lapidary arts, and as a collector's specimen.
Geological facts
Jasper is an opaque variety of chalcedony. In ancient times, Red Jasper was known as the 'stone of endurance' and was often used in the amulets of Egyptian priests and warriors.
Field identification & locations
Identify in the field by its distinct opaque red color, smooth conchoidal fracture (curved breaks), and extreme hardness (it will scratch glass). Commonly found in areas with volcanic activity or ancient sedimentary beds.
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