sedimentary
Jasper
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7; displays opaque brown, red, or yellow colors with a waxy to dull luster and conchoidal fracture.
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Physical properties
Mohs hardness of 6.5 to 7; displays opaque brown, red, or yellow colors with a waxy to dull luster and conchoidal fracture.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary basins or volcanic environments over millions of years.
Uses & applications
Commonly used for ornamental carvings, cabochons, polished display specimens, and gemstone jewelry.
Geological facts
Jasper has been utilized since ancient times for talismans, seals, and weaponry components across diverse civilizations.
Field identification & locations
Identify by its opacity, hardness scratching glass, and smooth microcrystalline texture; found worldwide in riverbeds and silicate-rich rock formations.
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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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Sandstone or Siltstone
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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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