sedimentary
Picture Jasper
Silicon dioxide (microcrystalline quartz, SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, earthy luster, and opaque with distinct brown, tan, and cream banding forming landscape patterns.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, earthy luster, and opaque with distinct brown, tan, and cream banding forming landscape patterns.
Formation & geological history
Formed through the deposition and silification of fine-grained sediments and muds in ancient ash beds or arid environments over millions of years.
Uses & applications
Widely used in lapidary arts, ornamental carvings, cabochons for jewelry, and prized as a collector specimen.
Geological facts
The intricate patterns resemble landscapes, earning it the moniker of the Earth writing its own story.
Field identification & locations
Identified by its rich, flowing earthy patterns and conchoidal fracture. Commonly sourced from the western United States, particularly Oregon and Idaho.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary