sedimentary
Jasper
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including green and brown, and conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including green and brown, and conchoidal fracture.
Formation & geological history
Formed from silica-rich fluids precipitating in sedimentary basins or volcanic environments over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and as a collector mineral.
Geological facts
Jasper has been used since ancient times for talismans, seals, and decorative art objects.
Field identification & locations
Found worldwide in riverbeds and mountainous regions; identified by its opaque nature and lack of cleavage.
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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
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary