sedimentary

Leopard Skin Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5-7 on the Mohs scale, with a vitreous to dull luster and a distinct patterned matrix of brown, tan, and cream spots.

Identified November 10, 2026More sedimentary →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, with a vitreous to dull luster and a distinct patterned matrix of brown, tan, and cream spots.

Formed through the silification of sedimentary or volcanic rocks where silica-rich fluids deposit quartz in fractures and cavities.

Commonly used for lapidary work, ornamental carvings, polished tumbling stones, and crystal jewelry.

Also known as jaguar stone, the distinctive spots are caused by mineral inclusions or leaching during formation.

Identify by its opaque, multicolored mottled pattern and conchoidal fracture; found globally, especially in Mexico and Brazil.

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)