sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, red to brown or multicolored, waxy to dull luster, cryptocrystalline structure, no cleavage with conchoidal fracture, specific gravity around 2.65
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, red to brown or multicolored, waxy to dull luster, cryptocrystalline structure, no cleavage with conchoidal fracture, specific gravity around 2.65
Formation & geological history
Forms from the precipitation of silica-rich fluids in sedimentary environments or volcanic ash, often filling cavities in rocks, with geological ages ranging from Precambrian to recent
Uses & applications
Used in ornamental carvings, jewelry, lapidary arts, and as a decorative stone
Geological facts
Jasper has been used since ancient times for seals, signet rings, and talismans, and is frequently found in riverbeds and glacial drift due to its weather resistance
Field identification & locations
Identify by its opaque nature, hardness that scratches glass, conchoidal fracture, and earthy red or brown tones; commonly found worldwide in areas with ancient volcanic or hydrothermal activity
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary