sedimentary
Red Jasper
Silicon dioxide (Microcrystalline Quartz, SiO2)
Hardness of 6.5 to 7 on the Mohs scale, red to reddish-brown color due to iron inclusions, waxy to dull luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.91.
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
Hardness of 6.5 to 7 on the Mohs scale, red to reddish-brown color due to iron inclusions, waxy to dull luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed from silica-rich sediments or volcanic ash that underwent diagenesis, often precipitating in marine environments or hydrothermal veins rich in iron oxide impurities, spanning various geological ages.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, tumbled stones, lapidary art, and occasionally for industrial grinding or abrasive purposes.
Geological facts
Red jasper has been used since ancient times to make seals, amulets, and weapons. In many cultures, it was considered a sacred stone of empowerment and protection.
Field identification & locations
Easily identified by its opaque red appearance, hardness capable of scratching glass, and smooth conchoidal fracture. Found worldwide, commonly in stream beds, river gravels, and sedimentary deposits.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary