sedimentary
Jasper
Silicon dioxide (SiO2) with impurities, microcrystalline quartz
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque luster, comes in various reddish-brown and earthy tones with conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, comes in various reddish-brown and earthy tones with conchoidal fracture.
Formation & geological history
Formed by the precipitation of silica from aqueous solutions in sedimentary environments or hydrothermal veins, often accumulating in ancient marine settings.
Uses & applications
Used primarily in ornamental carvings, cabochons, jewelry, and as a decorative stone in lapidary arts.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry components by various civilizations including the Minoans and Egyptians.
Field identification & locations
Identify by its waxy luster, opaque nature, hardness scratching glass, and distinctive banded or mottled earthy coloration. Commonly found in riverbeds and pebble beaches worldwide.
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Sandstone or Siltstone
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