sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness 6.5–7 on the Mohs scale; displays a dull to waxy luster, conchoidal fracture, and a deep reddish-purple to brown hue.
Identified More sedimentary →
Explore Jasper Pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness 6.5–7 on the Mohs scale; displays a dull to waxy luster, conchoidal fracture, and a deep reddish-purple to brown hue.
Formation & geological history
Formed via the deposition of silica-rich fluids in sedimentary or volcanic environments, often smoothed into flat disc shapes by fluvial or marine tumbling.
Uses & applications
Commonly used in lapidary arts, jewelry, decorative polished stones, and pocket worry stones.
Geological facts
Jasper gets its varied opaque colors from iron oxide and other mineral impurities incorporated during formation.
Field identification & locations
Recognized by its smooth water-worn surface, lack of cleavage, and resistance to scratching by a steel nail; widespread in riverbeds and gravel bars.
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