sedimentary
Red Jasper
Silicon Dioxide (SiO2 with Hematite inclusions)
Hardness: 6.5-7 on Mohs scale; Color: reddish-brown to deep brick red; Luster: dull to vitreous/waxy; Crystal structure: Microcrystalline/Trigonal; Cleavage: none (conchoidal fracture).
- Hardness
- 6
- Color
- reddish-brown to deep brick red
- Luster
- dull to vitreous/waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: reddish-brown to deep brick red; Luster: dull to vitreous/waxy; Crystal structure: Microcrystalline/Trigonal; Cleavage: none (conchoidal fracture).
Formation & geological history
Formed as silica-rich fluids permeate fine-grained sedimentary or volcanic rocks, absorbing iron oxides (hematite) which impart the characteristic deep red hue. Common in ancient microcrystalline sedimentary deposits worldwide.
Uses & applications
Used primarily in lapidary work, jewelry, decorative carvings, tumbling, and as a popular rock collecting specimen.
Geological facts
Red jasper has been used since antiquity for seals, amulets, and ornamental objects. Its red color is directly caused by fine inclusions of iron oxide (hematite).
Field identification & locations
Identify by its opaque red tone, smooth microcrystalline texture, hardness that scratches glass, and conchoidal fracture pattern. Commonly found along riverbeds, beaches, and quartz veins.
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