sedimentary

Rainforest Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, earthy luster, and distinct orbicular or concentric ring patterns in red, brown, and tan.

Identified November 11, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, earthy luster, and distinct orbicular or concentric ring patterns in red, brown, and tan.

Formed through the deposition and silification of volcanic ash or silica-rich fluids in cavity linings over millions of years.

Primarily cut and polished into cabochons for jewelry, decorative objects, and favored by lapidary collectors.

Despite its name, it is actually a form of orbicular jasper rather than a true rainforest rhyolite, prized for its unique eye-like patterns.

Identify by its striking concentric ring patterns and conchoidal fracture. Commonly found in Western Australia and Madagascar.

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

Sandstone or Siltstone

Arenite (if sandstone)

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)