sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7, typically brown, red, or yellow, with a vitreous to dull luster and cryptocrystalline structure.
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Physical properties
Mohs hardness of 6.5 to 7, typically brown, red, or yellow, with a vitreous to dull luster and cryptocrystalline structure.
Formation & geological history
Formed via the precipitation of silica-rich fluids in sedimentary or volcanic environments over millions of years.
Uses & applications
Commonly used in ornamental carvings, cabochons, jewelry, and polished collector specimens.
Geological facts
Jasper has been utilized since ancient times for talismans, seals, and weaponry components due to its toughness.
Field identification & locations
Identified by its opaque appearance, conchoidal fracture, and lack of fizz with hydrochloric acid; found globally in alluvial deposits and rock formations.
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Other sedimentary specimens
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
fossil
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