sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, red to reddish-brown color due to iron oxide impurities, waxy to dull luster, cryptocrystalline structure with conchoidal fracture, and specific gravity of 2.58-2.91.
Identified More sedimentary →
Explore Jasper in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6.5-7 on the Mohs scale, red to reddish-brown color due to iron oxide impurities, waxy to dull luster, cryptocrystalline structure with conchoidal fracture, and specific gravity of 2.58-2.91.
Formation & geological history
Formed via the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often originating from ancient marine deposits or volcanic ash beds dating from various geological eras.
Uses & applications
Commonly used for lapidary work, decorative carvings, cabochons in jewelry, and collected by rockhounds.
Geological facts
Jasper has been used since antiquity for seals, talismans, and decorative items. The red variety is heavily colored by iron oxide inclusions.
Field identification & locations
Can be identified in the field by its opaque red-brown color, hardness that scratches glass, and smooth conchoidal fracture. Found worldwide in riverbeds, ancient marine deposits, and mountainous regions.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary