sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs); Color: Bricky opaque red; Luster: Dull to vitreous; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Bricky opaque red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Bricky opaque red; Luster: Dull to vitreous; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in cracks and volcanic ash, often associated with banded iron formations. The red color comes from iron oxide (hematite) impurities during mineralization.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons), interior decoration, and as a popular specimen for rock tumbling and metaphysical collections.
Geological facts
The name Jasper comes from the Greek word 'iaspis', meaning 'spotted stone'. In ancient times, it was known as the 'rain bringer' and was used in talismans to protect warriors.
Field identification & locations
Identify by its opaque nature (unlike carnelian which is translucent), its smooth conchoidal fractures, and its inability to be scratched by a steel knife. It is frequently found in riverbeds and desert environments globally.
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