sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, waxy to dull luster, opaque green and yellow coloration, and a conchoidal fracture.

Identified October 21, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, waxy to dull luster, opaque green and yellow coloration, and a conchoidal fracture.

Formed through the silification of sedimentary or volcanic rocks, where silica-rich fluids precipitate quartz in pore spaces over millions of years.

Used primarily in lapidary work, decorative carvings, cabochons, and as an ornamental gemstone.

Jasper has been utilized by ancient civilizations since antiquity for tools, seals, and amulets due to its durability and rich earth tones.

Commonly found in alluvial deposits and riverbeds worldwide. Identified by its opacity, smooth polished feel, and multicolored banding.

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)