sedimentary

Red Jasper

Silicon Dioxide (SiO2 with Fe2O3 inclusions)

Hardness: 6.5-7 on Mohs scale. Color: Brick red to brownish-red. Luster: Waxy to dull (earthy). Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58-2.91.

Hardness: 6
Color: Brick red to brownish-red
Luster: Waxy to dull (earthy)

Identified July 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms through chemical precipitation of microcrystalline quartz or secondary silicates filling cavities in volcanic or sedimentary rocks, enriched with iron oxide impurities during formation.

Uses & applications

Used in lapidary work, cabochon cutting, jewelry, carvings, decorative stones, and as a popular specimen for rock tumbling and polishing.

Geological facts

Red Jasper derives its distinctive reddish coloration from fine dispersions of hematite (iron oxide). It has been used for thousands of years by ancient civilizations for protective amulets and seals.

Field identification & locations

Identified by its rich red to reddish-brown opaque appearance, smooth waxy surface when water-worn or tumbled, and inability to be scratched by a steel blade. Found abundantly worldwide in riverbeds, gravel deposits, and sedimentary layers.

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