sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Hardness: 6.5-7 on Mohs scale; Color: Brick red to deep brownish-red; Luster: Dull to vitreous when polished; Crystal structure: Trigonal (microcrystalline quartz); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.58-2.91.

Hardness: 6
Color: Brick red to deep brownish-red
Luster: Dull to vitreous when polished

Identified July 22, 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 when fine particulate silica precipitates from volcanic fluids or groundwater within sedimentary beds, incorporating abundant microcrystalline iron oxide (hematite) which imparts the characteristic deep red coloration.

Uses & applications

Widely used as an ornamental stone, for lapidary work, cabochons, carvings, decorative landscaping, and crystal healing/collecting practices.

Geological facts

Ancient civilizations considered red jasper a sacred stone of strength and protection. In ancient Egypt, it was associated with the blood of Isis and carved into protective amulets.

Field identification & locations

Identified in the field by its distinctive brick-red color, dull unpolished surface, opaque transparency, and high hardness (scratches glass). Commonly found in South Africa, India, Brazil, Australia, and the western United States.

Other sedimentary specimens

See all

Sandstone or Siltstone

Arenite (if sandstone)

Sedimentary

Sedimentary Sandstone

Arenite (Sedimentary Rock)

sedimentary

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

fossil

Shale

Shale (clastic sedimentary rock)

sedimentary

Brown Sandstone (River Rock)

Arenite

sedimentary

Shale

Argillaceous sedimentary rock

sedimentary