sedimentary

Agate

Silicon Dioxide (SiO2)

Hardness of 6.5-7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, and conchoidal fracture.

Identified November 14, 2026More sedimentary →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, and conchoidal fracture.

Formed by the deposition of silica from groundwater in cavities of igneous and sedimentary rocks.

Used extensively in jewelry, ornamental carvings, and precision instruments.

Agate bands represent successive layers of silica deposition over millions of years in volcanic vesicles.

Identified by its distinctive concentric banding and translucency; commonly found worldwide in volcanic regions.

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

Shale

Fissile Sedimentary Rock

Sandstone

Arenite

Shale

Clastic sedimentary rock