sedimentary
Red Jasper
Silicon Dioxide with Hematite (SiO2 + Fe2O3)
Hardness: 6.5-7 on Mohs scale; Color: Terracotta red to deep brownish-red; Luster: Vitreous to dull; Structure: Microcrystalline/cryptocrystalline (trigonal); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Terracotta red to deep brownish-red
- Luster
- Vitreous to dull
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Terracotta red to deep brownish-red; Luster: Vitreous to dull; Structure: Microcrystalline/cryptocrystalline (trigonal); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica-rich fluids in cracks or volcanic cavities, where iron oxide (Hematite) inclusions provide the red pigment. It is often found in prehistoric sedimentary formations.
Uses & applications
Widely used for lapidary work, jewelry (cabochons, beads), decorative ornaments, and as a popular pocket stone for collectors.
Geological facts
Known historically as the 'supreme nurturer,' Red Jasper has been used since antiquity in seals, amulets, and ring stones across Egyptian and Roman civilizations.
Field identification & locations
Identify by its opaque red color and high hardness (it cannot be scratched by a steel knife). Commonly found in riverbeds or coastal areas in India, Brazil, USA, and South Africa. Look for a smooth, waxy surface when tumbled.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary