sedimentary
Chalcedony Nodule
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy luster, translucent to opaque, and displays conchoidal fracture.
Identified More sedimentary →
Explore Chalcedony Nodule in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy luster, translucent to opaque, and displays conchoidal fracture.
Formation & geological history
Formed through the deposition of silica-rich groundwater within cavities of sedimentary or volcanic rocks.
Uses & applications
Used primarily in lapidary arts, ornamental carvings, and gemstone jewelry.
Geological facts
Chalcedony is the cryptocrystalline form of silica, encompassing varieties like agate, jasper, and onyx.
Field identification & locations
Identify by its characteristic waxy luster and smooth, conchoidal broken surfaces; commonly found worldwide in cavities of weathered rocks.
More like this
Other sedimentary specimens
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
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary