sedimentary

Red Jasper

Silicon Dioxide with iron impurities (Quartz variety, SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Red, reddish-brown, brick red with white/lighter quartz or chalcedony veins; Luster: Vitreous to dull; Crystal structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Luster: Vitreous to dull

Identified August 1, 2026More sedimentary →

Explore Red Jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through the hydrothermal deposition of silica-rich fluids or accumulation of silica-rich radiolarian ooze in marine environments, often associated with iron-rich sedimentary deposits. Geological age varies widely depending on the formation site, ranging from Precambrian to Cenozoic.

Uses & applications

Used primarily in lapidary work, decorative carvings, cabochons for jewelry, and ornamental objects. Also popular as a specimen for rock collectors.

Geological facts

Jasper has been used since ancient times (dating back over 5,000 years) for amulets, seals, and tools. Red jasper is specifically mentioned in various historical texts and mythologies for its supposed grounding and protective properties.

Field identification & locations

Can be identified in the field by its opaque red color, microcrystalline texture, and hardness that scratches glass. Common locations include India, Brazil, Russia, Madagascar, and various parts of the United States.

Other sedimentary specimens

See all

Sandstone or Siltstone

Arenite (if sandstone)

Sedimentary

Quartz pebble

Silicon dioxide (SiO2)

sedimentary

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

sedimentary

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

fossil

Sedimentary Sandstone

Arenite (Sedimentary Rock)

sedimentary

Banded Siltstone / Mudstone Pebble

Siltstone / Argillite

sedimentary