sedimentary
Red Jasper
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7; earthy red to brownish-red color; vitreous to dull luster; cryptocrystalline structure; conchoidal fracture.
Identified More sedimentary →
Explore Red Jasper in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Mohs hardness of 6.5 to 7; earthy red to brownish-red color; vitreous to dull luster; cryptocrystalline structure; conchoidal fracture.
Formation & geological history
Forms through the silica-rich precipitation of hydrothermal fluids or silica-rich sediments, often accumulating in marine environments.
Uses & applications
Widely used in ornamental carvings, cabochons, polished decorative stones, and lapidary collections.
Geological facts
Red jasper has been used since antiquity for talismans, seals, and weaponry components due to its toughness.
Field identification & locations
Identified easily by its opaque red color, smooth conchoidal break, and lack of reaction to acid. Found worldwide, particularly in India, Brazil, and the USA.
More like this
Other sedimentary specimens
Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary