sedimentary
Jasper
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness 6.5 to 7 on the Mohs scale, earthy to waxy luster, opaque, and occurs in various colors like brown, red, and yellow due to iron impurities.
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Physical properties
Hardness 6.5 to 7 on the Mohs scale, earthy to waxy luster, opaque, and occurs in various colors like brown, red, and yellow due to iron impurities.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks, often precipitating from silica-rich solutions in marine or hydrothermal environments.
Uses & applications
Used primarily for ornamental carvings, cabochons, jewelry, and as a popular collectible gemstone.
Geological facts
Jasper has been used since ancient times for seals, talismans, and decorative items. Its name means 'spotted or speckled stone'.
Field identification & locations
Identified easily by its conchoidal fracture, lack of cleavage, and opaque appearance. Found globally in alluvial deposits and ancient riverbeds.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
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