sedimentary
Jasper
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque, and comes in various colors including red, brown, yellow, and green.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque, and comes in various colors including red, brown, yellow, and green.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks, where silica-rich fluids replace original material over millions of years.
Uses & applications
Commonly used for ornamental carvings, polished cabochons in jewelry, and as a popular specimen for rock collectors.
Geological facts
Jasper has been used since ancient times for seals, talismans, and decorative tools due to its durability and rich coloration.
Field identification & locations
Easily identified in the field by its conchoidal fracture, waxy luster, and resistance to scratching by steel. Found globally in riverbeds and mountainous terrain.
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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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