sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale. Varies in color from red, brown, yellow to green, often with opaque luster and conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale. Varies in color from red, brown, yellow to green, often with opaque luster and conchoidal fracture.
Formation & geological history
Formed through the silification of sedimentary or volcanic deposits where silica-rich fluids replace original material.
Uses & applications
Used in ornamental carvings, jewelry, cabochons, and decorative items.
Geological facts
Jasper has been used since ancient times for seals, talismans, and decorative weaponry across various civilizations.
Field identification & locations
Identify by its opaque nature, smooth waxy luster when polished, and hardness that scratches glass. Found worldwide in riverbeds and mountainous regions.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
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Sandstone or Siltstone
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Sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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