sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91.

Hardness: 6
Color: Brick red to brownish-red
Luster: Vitreous to dull

Identified February 10, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich fluids in cracks and cavities within other rocks, typically during hydrothermal processes or as sedimentary deposits. The red color is caused by the oxidation of iron (hematite) during formation.

Uses & applications

Primarily used in jewelry for cabochons, beads, and wire-wrapped pendants; also used in decorative ornaments, stone carvings, and as a popular specimen for crystal healing and mineral collectors.

Geological facts

Jasper has been used as a gemstone since antiquity and is mentioned in various historical texts, including the Bible. King's seals in ancient Mesopotamia were often carved from Red Jasper due to its durability.

Field identification & locations

Identify in the field by its opaque nature (unlike agate), smooth waxy feel when tumbled, and a streak test that usually produces a white or pale color despite the red body. It is commonly found in India, Russia, Brazil, and the USA (southwestern states).

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