sedimentary
Picture Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, earthy luster, opaque, and features brown to black dendritic patterns resembling landscapes.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, earthy luster, opaque, and features brown to black dendritic patterns resembling landscapes.
Formation & geological history
Formed from silica-rich mud or volcanic ash filling cavities, with iron and manganese oxides seeping in to create branching patterns over millions of years.
Uses & applications
Widely used in lapidary arts, ornamental carvings, cabochons, and gemstone jewelry.
Geological facts
The intricate patterns are often caused by capillary action drawing mineral-rich water through microscopic cracks in the drying stone.
Field identification & locations
Identified by its distinctive landscape-like banding and conchoidal fracture, commonly found in desert regions like Oregon and Africa.
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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