sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque luster, smooth conchoidal fracture, and typically red, brown, or yellow due to iron oxide impurities.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, smooth conchoidal fracture, and typically red, brown, or yellow due to iron oxide impurities.
Formation & geological history
Formed through the silification of sedimentary deposits or volcanic ash, occurring in hydrothermal veins and marine sedimentary environments over millions of years.
Uses & applications
Widely used in ornamental carvings, cabochons, jewelry, and as a decorative lapidary stone.
Geological facts
Ancient cultures valued jasper as a sacred talisman for courage and healing, frequently carving it into seals and amulets.
Field identification & locations
Identify by its opacity, waxy luster, and resistance to scratching by steel. Common worldwide in riverbeds, ancient marine deposits, and volcanic regions.
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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
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary