sedimentary
Agate
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy luster, and conchoidal fracture. It displays characteristic banded colors formed by alternating layers of microcrystalline quartz.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy luster, and conchoidal fracture. It displays characteristic banded colors formed by alternating layers of microcrystalline quartz.
Formation & geological history
Formed by the deposition of silica from groundwater in cavities of ancient volcanic and sedimentary rocks. Geological age varies widely depending on the host rock.
Uses & applications
Used primarily in ornamental jewelry, decorative carvings, and precision instruments.
Geological facts
Agate is one of the most popular materials for lapidary work and has been used by humans for adornment and tools since Neolithic times.
Field identification & locations
Identify in the field by its distinct translucent bands and waxy sheen, commonly found in desert environments weathering out of host rocks.
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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
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary