sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities, microcrystalline quartz
Hardness of 6.5 to 7 on the Mohs scale, colors range from red, brown, yellow to green due to iron oxide impurities, waxy to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 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 to 7 on the Mohs scale, colors range from red, brown, yellow to green due to iron oxide impurities, waxy to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often originating from ancient marine sediments, spanning various geological ages from Precambrian to Cenozoic.
Uses & applications
Used for ornamental objects, carvings, cabochons, jewelry, and polished display pieces by collectors.
Geological facts
Jasper has been used since ancient times for seals, signet rings, and talismans, and is frequently mentioned in historical texts as a precious stone.
Field identification & locations
Identified by its opaque appearance, smooth waxy surface when tumbled or waterworn, and characteristic banded or spotted patterns caused by mineral impurities. Found globally in riverbeds, mountainous regions, and desert environments.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary