sedimentary
Jasper
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, red to brownish-red color with dull to greasy luster, cryptocrystalline structure with conchoidal fracture.
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 brownish-red color with dull to greasy luster, cryptocrystalline structure with conchoidal fracture.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks, often via silica-rich hydrothermal fluids or chemical precipitation in marine environments.
Uses & applications
Used primarily in lapidary work, decorative carvings, cabochons, and as an ornamental gemstone.
Geological facts
Red jasper gets its vibrant color from iron oxide inclusions. It has been used since ancient times for amulets and seals.
Field identification & locations
Identify by its opaque red color, hardness scratching glass, and smooth waxy feel; commonly found in riverbeds and jasperoid deposits worldwide.
More like this
Other sedimentary specimens
Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary