sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, opaque luster, various colors including red, green, and brown, with a conchoidal fracture.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque luster, various colors including red, green, and brown, with a conchoidal fracture.
Formation & geological history
Formed through the precipitation of silica from water in sedimentary environments or hydrothermal veins, often over millions of years.
Uses & applications
Used primarily in lapidary arts, ornamental carvings, and gemstone jewelry making.
Geological facts
Jasper has been used since ancient times for seals, talismans, and decorative items due to its durability and rich patterns.
Field identification & locations
Identify by its waxy luster, opacity, and distinctive multicolored banding or patterns; commonly found worldwide in riverbeds and ancient seabed deposits.
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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)
Sedimentary
Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary