sedimentary
Red Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown to brick-red color due to iron inclusions, waxy to dull luster, cryptocrystalline or microcrystalline crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.91.
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 of 6.5 to 7 on the Mohs scale, reddish-brown to brick-red color due to iron inclusions, waxy to dull luster, cryptocrystalline or microcrystalline crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the precipitation of silica-rich fluids in marine or sedimentary environments, often associated with iron-rich deposits. Geological age varies widely depending on the formation site, ranging from Precambrian banded iron formations to younger deposits.
Uses & applications
Used primarily in lapidary work, decorative carvings, ornamental stones, and jewelry. Also collected by rockhounds and mineral enthusiasts.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name comes from the Greek word iaspis, meaning 'spotted stone'.
Field identification & locations
Easily identified by its opaque red color, smooth tumbled texture from wave action, and hardness that scratches glass. Commonly found in riverbeds, beaches, and areas with ancient marine sedimentary deposits.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary