sedimentary
Agate
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale with a waxy to vitreous luster and microcrystalline crystal structure.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale with a waxy to vitreous luster and microcrystalline crystal structure.
Formation & geological history
Formed by the deposition of silica from groundwater in cavities of igneous and sedimentary rocks over millions of years.
Uses & applications
Widely used in decorative items, jewelry, carvings, and precision instruments.
Geological facts
Agate is a variety of chalcedony that often forms in concentric bands, creating unique natural patterns.
Field identification & locations
Identified by its distinctive banding and conchoidal fracture, commonly found worldwide in volcanic rock cavities.
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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