sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities, Microcrystalline Quartz
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown to brownish-red color, vitreous to dull luster, cryptocrystalline or microcrystalline 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, reddish-brown to brownish-red color, vitreous to dull luster, cryptocrystalline or microcrystalline 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 accumulating in marine basins or volcanic ash deposits over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, lapidary arts, and as a popular specimen for rock collectors.
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
Can be identified in the field by its hardness (scratches glass), waxy to dull luster, and opaque reddish or multicolored appearance. Found worldwide in riverbeds, alluvial gravels, 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