sedimentary
Jasper
Silicon dioxide, cryptocrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, earthy to vitreous luster, opaque brown color, conchoidal fracture with no cleavage.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, earthy to vitreous luster, opaque brown color, conchoidal fracture with no cleavage.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary basins or volcanic environments, often dating from Precambrian formations.
Uses & applications
Used primarily in ornamental carvings, cabochons, lapidary arts, and as a decorative stone.
Geological facts
Jasper has been used since antiquity for ancient seals, talismans, and jewelry, highly valued across numerous ancient civilizations.
Field identification & locations
Identified by its dense, opaque appearance and high hardness that scratches glass. Common globally, including alluvial deposits in Minas Gerais, Brazil.
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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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