sedimentary
Jasper
Silicon dioxide (SiO2) microcrystalline quartz
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, typically yellow, brown, red, or green, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, typically yellow, brown, red, or green, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids or silty sediments in marine or terrestrial environments, often altered by hydrothermal activity or diagenesis over millions of years.
Uses & applications
Used for making jewelry, ornamental carvings, decorative objects, and historically for stone tools and weapons.
Geological facts
Jasper has been used by humans since ancient times for talismans, seals, and weaponry. Its name means 'spotted or speckled stone.'
Field identification & locations
Found worldwide in sedimentary deposits, stream beds, and weathering zones. Identified by its waxy luster, opaque nature, and conchoidal fracture.
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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)
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