sedimentary
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
Mohs hardness of 6.5 to 7, typically red, reddish-brown, or brick-red with minor white or dark banding, waxy to vitreous luster, cryptocrystalline or microfibrous crystal structure, conchoidal fracture, 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
Mohs hardness of 6.5 to 7, typically red, reddish-brown, or brick-red with minor white or dark banding, waxy to vitreous luster, cryptocrystalline or microfibrous crystal structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Forms through the hydrothermal deposition of silica-rich solutions or the accumulation of silica in marine sedimentary environments, often replacing organic material or filling fractures in volcanic rock. Geological age varies widely depending on the deposit.
Uses & applications
Widely used for making ornamental objects, cabochons, beads, small carvings, and polished display pieces in the jewelry and lapidary arts.
Geological facts
Red jasper has been used since ancient times by various civilizations for amulets, seals, and weaponry. The red color is primarily due to iron oxide (hematite) inclusions within the silica matrix.
Field identification & locations
Easily identified by its opaque red color, hardness that easily scratches glass, and smooth conchoidal fracture. Found worldwide, particularly in Brazil, India, Russia, and the United States.
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
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary