sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, opaque luster, massive crystal habit, and reddish-brown coloration from iron oxide impurities.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque luster, massive crystal habit, and reddish-brown coloration from iron oxide impurities.
Formation & geological history
Formed through the silification of sedimentary deposits or volcanic ash, primarily in ancient marine environments.
Uses & applications
Commonly used in lapidary arts, ornamental carvings, cabochons, and as a collector mineral.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry due to its durability and rich colors.
Field identification & locations
Identify by its waxy luster, lack of cleavage, and conchoidal fracture. Found worldwide in riverbeds and mountainous 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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Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary