sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Hardness: 6.5-7.0 (Mohs scale); Color: Brick red to deep brownish-red; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to deep brownish-red
Luster: Vitreous to waxy

Identified July 20, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when fine silica chemistry settles into sedimentary layers or replaces organic material. The red color is caused by the inclusion of iron oxides (hematite) during the crystallization process. It can be found in ancient sedimentary beds across various geological ages.

Uses & applications

Used primarily as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock tumbling. Historically used for making tools due to its conchoidal fracture.

Geological facts

Red Jasper was known as the 'rain bringer' in some ancient cultures and is mentioned in various historical texts as a stone of strength and protection. It is a variety of chalcedony.

Field identification & locations

Identify in the field by its opaque deep red color, smooth waxy surface when damp, and its ability to scratch glass. It is commonly found in riverbeds and coastal regions in places like India, Brazil, and the Southwestern USA.

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