sedimentary
Jasper and Greenstone
Microcrystalline quartz (SiO2) and altered basalt
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque, and displays red, brown, and greyish-green coloration with conchoidal fracture.
Identified More sedimentary →
Explore Jasper and Greenstone in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque, and displays red, brown, and greyish-green coloration with conchoidal fracture.
Formation & geological history
Formed via silica-rich chemical precipitation in marine environments and hydrothermal alteration of volcanic rock over hundreds of millions of years.
Uses & applications
Used primarily in lapidary arts for cabochons, carvings, and ornamental stone or mineral collecting.
Geological facts
Jasper has been utilized since ancient times for talismans and tools due to its toughness and ability to take a high polish.
Field identification & locations
Identify by its hardness, lack of cleavage, waxy luster, and distinctive red and green mottled coloration. Commonly found in riverbeds and mountainous regions.
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