sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Deep earthen red to brownish-red; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep earthen red to brownish-red
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep earthen red to brownish-red; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of silica in sedimentary environments or hydrothermal veins, where iron oxide (hematite) provides the opaque red pigmentation.
Uses & applications
Commonly used for lapidary work, jewelry (cabochons and beads), pocket stones, and decorative carvings.
Geological facts
In antiquity, red jasper was known as a 'bringer of courage' and was often used in amulets by Egyptians and Native Americans. It is an opaque variety of chalcedony.
Field identification & locations
Identify by its opaque red color, smooth waxy feel when polished, and inability to be scratched by a steel knife. It is frequently found in riverbeds and arid regions globally.
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