sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Red to brownish-red, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture)
- 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: Red to brownish-red, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture)
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, with its red color derived from iron oxide (hematite) impurities during the silicification process.
Uses & applications
Used primarily in lapidary arts for jewelry, belt buckles, decorative carvings, and as a popular focus for meditation and metaphysical collections.
Geological facts
Jasper is a variety of chalcedony. Historically, it was known as the 'supreme nurturer' and has been used by various cultures for talismans and decorative inlay work for thousands of years.
Field identification & locations
Identify by its deep opaque red color and high hardness (it cannot be scratched by a steel knife). Commonly found in riverbeds or near volcanic deposits in locations like India, Brazil, and the Southwestern US.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary