sedimentary
Jasper
Microcrystalline quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, colors range from yellow, brown, red, to green due to iron oxide impurities, waxy to vitreous luster, amorphous or cryptocrystalline crystal structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Identified More sedimentary →
Explore Jasper 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, colors range from yellow, brown, red, to green due to iron oxide impurities, waxy to vitreous luster, amorphous or cryptocrystalline crystal structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary basins or volcanic environments, often replacing organic material or filling cracks and cavities over millions of years.
Uses & applications
Used for ornamental carvings, polished stones, cabochons in jewelry, and as a decorative stone.
Geological facts
Jasper has been used by ancient civilizations since antiquity for tools, seals, and ornamentation. It is mentioned in various historical texts as one of the most valued stones of the ancient world.
Field identification & locations
Can be identified in the field by its smooth, water-worn texture, conchoidal fracture, opaque appearance, and resistance to scratching from steel. Found worldwide in riverbeds, marine deposits, and mountainous regions.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary