sedimentary

Jasper and Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, featuring red and grey-white coloration with a vitreous to dull luster and conchoidal fracture.

Identified November 7, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, featuring red and grey-white coloration with a vitreous to dull luster and conchoidal fracture.

Formed through the hydrothermal deposition of silica-rich fluids filling fractures in host rock, often in ancient marine environments.

Used primarily in ornamental carvings, cabochons, and as a popular specimen for mineral collectors.

Jasper is an opaque variety of chalcedony, while the accompanying grey matrix is typically microcrystalline quartz.

Easily identified by its high hardness (scratches glass) and distinctive red and grey banding; found worldwide.

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

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)