sedimentary

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5 to 7 on Mohs scale; Color: Deep red to reddish-brown; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture).

Hardness: 6
Color: Deep red to reddish-brown
Luster: Dull to vitreous

Identified July 15, 2026More sedimentary →

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Physical properties

Hardness: 6.5 to 7 on Mohs scale; Color: Deep red to reddish-brown; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture).

Formation & geological history

Jasper is a variety of chalcedony formed through the deposition of silica from water into volcanic or sedimentary rocks. The red color is specifically caused by the presence of iron oxide (hematite) during formation.

Uses & applications

Used extensively as a gemstone, in jewelry (beads, cabochons), for ornamental carvings, and in industrial applications like mortar and pestles due to its hardness.

Geological facts

Red Jasper has been respected since ancient times as a stone of protection and endurance. It was once called the 'rain-bringer' and is mentioned in various historical texts across many cultures.

Field identification & locations

Identified in the field by its opaque red appearance, smoothness when water-worn, and inability to be scratched by a steel knife. Frequently found in riverbeds and along coastlines as rounded pebbles.