sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Brick-red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Hexagonal (cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
Identified More sedimentary →
Explore Red Jasper in the encyclopedia →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: Hexagonal (cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed when silica-rich fluids permeate through volcanic ash or sedimentary rocks, often associated with hydrothermal activity. Its red color is derived from high concentrations of iron inclusions.
Uses & applications
Used primarily for lapidary work, jewelry (beads, cabochons), ornamental sculpture, and as a popular stone for collectors and metaphysical practitioners.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back in Hebrew, Assyrian, Greek, and Latin words. It is one of the traditional birthstones for March.
Field identification & locations
Identify in the field by its opaque nature (unlike carnelian which is translucent), its smooth waxy feel when polished, and its inability to be scratched by a steel knife. Common in the western USA, Brazil, and India.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
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 (primarily SiO2)
sedimentary