sedimentary
Red Jasper (Quartzite conglomerate)
Silicon dioxide (SiO2) with Iron inclusions
Hardness: 6.5-7 (Mohs scale), Color: Rusty red, brown to maroon, Luster: Dull to vitreous when wet, Crystal structure: Microcrystalline/Trigonal, Cleavage: None/Conchoidal fracture, 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: Rusty red, brown to maroon, Luster: Dull to vitreous when wet, Crystal structure: Microcrystalline/Trigonal, Cleavage: None/Conchoidal fracture, Specific gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica-rich sediments or the chemical replacement of volcanic ash/limestone. The red color is derived from iron oxides (hematite) present during formation. These rocks can be found in terrains ranging from Precambrian to recent.
Uses & applications
Used primarily for ornamental purposes, lapidary arts (cabochons, beads), decorative garden stones, and historic use as flint for fire-starting.
Geological facts
Red jasper has been used for millennia; it was known as the 'rain-bringer' in many ancient cultures and was often featured in the jewelry of Egyptian pharaohs and Roman seals.
Field identification & locations
Identify in the field by its distinct red-orange hue, high hardness (cannot be scratched by a steel knife), and smooth, shell-like (conchoidal) fracture planes where it has been chipped. Commonly found in river beds or areas with exposed sedimentary or volcanic outcrops.
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