sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including red, brown, and green, with a conchoidal fracture.

Identified November 12, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including red, brown, and green, with a conchoidal fracture.

Formed through the silification of sedimentary or volcanic deposits in marine environments, often dating back hundreds of millions of years.

Used extensively for ornamental carvings, polished cabochons in jewelry, and decorative landscaping stones.

Ancient civilizations prized jasper for talismans and amulets, often associating it with courage and strength.

Easily identified by its opaque nature and fine-grained texture; found globally in riverbeds, mountainous regions, and ancient sea beds.

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)