sedimentary
Red Jasper
Silicon Dioxide with Hematite (SiO2 + Fe2O3)
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
- Hardness
- 6
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic ash or sedimentary rocks. The red color comes from high concentrations of iron inclusions (Hematite) during the silicon dioxide's crystallization process.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a popular pocket stone for collectors.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back in Arabic, Persian, Hebrew, Assyrian, Greek, and Latin. It is often found in banded iron formations.
Field identification & locations
Identify by its opaque nature (unlike carnelian which is translucent), its smooth conchoidal fracture, and deep red streak. Commonly found in India, Brazil, USA, and South Africa.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary