sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 on the Mohs scale; Color: Rusty red to brownish-red; Luster: Dull to vitreous; Crystal structure: Hexagonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Rusty red to brownish-red
- Luster
- Dull to vitreous
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 on the Mohs scale; Color: Rusty red to brownish-red; Luster: Dull to vitreous; Crystal structure: Hexagonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Forms when silica-rich fluids permeate through volcanic or sedimentary rocks. The red color is caused by the presence of iron oxide (hematite) during the microcrystalline quartz formation.
Uses & applications
Used primarily for jewelry (cabochons), interior decoration, and as a semi-precious gemstone in ornamental carvings.
Geological facts
Red Jasper has been used since ancient times for amulets and carvings; it was once known as the 'bringer of rain' in certain cultures. It is often found in large nodules or as part of Banded Iron Formations.
Field identification & locations
Identify by its waxy to dull luster, lack of cleavage, and smooth, often conchoidal fracture. Commonly found in riverbeds or gravel deposits in areas with volcanic history.
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