sedimentary

Condor Agate

Silicon Dioxide (Chalcedony), SiO2

Hardness of 6.5 to 7 on the Mohs scale, waxy luster, and trigonal crystal system with distinct concentric banding.

Identified November 12, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, waxy luster, and trigonal crystal system with distinct concentric banding.

Formed through the deposition of silica-rich groundwater within cavities of volcanic rocks over millions of years.

Primarily used in lapidary arts, high-end jewelry, and as collectible ornamental stones.

Renowned for its vibrant natural colors and distinct circular eye formations, discovered in the mountains of Argentina.

Identified by its translucent banded patterns and orbicular eye designs; commonly found in riverbeds and volcanic deposits.

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)