sedimentary
Orbicular Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, featuring distinct spherical or ring-like orbicular patterns in red, brown, and grey with a vitreous to dull luster.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, featuring distinct spherical or ring-like orbicular patterns in red, brown, and grey with a vitreous to dull luster.
Formation & geological history
Formed via the rhythmic crystallization of silica gel around nucleation sites in volcanic or sedimentary cavities over millions of years.
Uses & applications
Primarily cut and polished into cabochons for jewelry, decorative objects, and sought after by rock collectors.
Geological facts
The unique orbicular patterns are also known as spherulites, created by radial crystal growth in silica-rich fluids.
Field identification & locations
Easily identified by its colorful concentric spheres or circles embedded in a contrasting matrix; found globally including Madagascar, Russia, and the western United States.
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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
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Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary