sedimentary
Jasper
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones of red, brown, and yellow, and a microcrystalline or cryptocrystalline structure.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones of red, brown, and yellow, and a microcrystalline or cryptocrystalline structure.
Formation & geological history
Formed from silica-rich fluids precipitating in sedimentary environments or hydrothermal veins, often associated with volcanic ash.
Uses & applications
Used extensively for ornamental carvings, cabochons in jewelry, decorative items, and lapidary collecting.
Geological facts
Jasper has been used since ancient times for amulets, seals, and tools, with some varieties named after their striking natural patterns.
Field identification & locations
Identify by its waxy luster, conchoidal fracture, and opacity; commonly found in riverbeds, glacial deposits, and ancient seabeds worldwide.
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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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