sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, opaque luster, concoidal fracture, and comes in various earthy tones including brown, red, and yellow.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque luster, concoidal fracture, and comes in various earthy tones including brown, red, and yellow.
Formation & geological history
Formed from silica-rich fluids precipitating in sedimentary environments or volcanic fissures, often occurring in ancient marine deposits.
Uses & applications
Used widely for ornamental carvings, polished cabochons in jewelry, and as a durable decorative stone.
Geological facts
Jasper has been utilized by ancient civilizations globally since the 4th millennium BC for amulets, seals, and tools.
Field identification & locations
Identify by its complete opacity, smooth waxy polish, and lack of cleavage; commonly found in stream beds and hydrothermal vein deposits worldwide.
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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
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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