sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale. Colors range from brown, red, to yellow with an opaque, waxy luster and trigonal crystal structure.
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Physical properties
Hardness of 7 on Mohs scale. Colors range from brown, red, to yellow with an opaque, waxy luster and trigonal crystal structure.
Formation & geological history
Formed via the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins over millions of years.
Uses & applications
Used extensively in lapidary arts, ornamental carvings, and gemstone jewelry.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry like arrowheads due to its conchoidal fracture.
Field identification & locations
Identify by its opaque nature and fine-grained texture; commonly found worldwide in alluvial gravels and ancient riverbeds.
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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
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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)
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