sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5–7 on Mohs scale; Color: Opaque brick red to brownish-red due to iron inclusions; Luster: Dull to vitreous; Crystal Structure: Microcrystalline/Cryptocrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91.

Hardness: 6
Color: Opaque brick red to brownish-red due to iron inclusions
Luster: Dull to vitreous

Identified March 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica in pockets of volcanic rock or through sedimentary processes where silica-rich fluids replace organic material or fill voids. The red color is typically the result of iron oxidation occurring over millions of years.

Uses & applications

Extensively used in lapidary work for cabochons, beads, and sculpture. Historically used for seals and amulets. Also used in decor and as a healing stone in various cultural practices.

Geological facts

In antiquity, red jasper was known as the 'rain bringer' and was mentioned in various biblical and ancient Egyptian texts. It is a member of the chalcedony family, distinguished by its opacity compared to translucent carnelian.

Field identification & locations

Identify in the field by its opaque deep red color and smooth, glass-like (conchoidal) fracture surfaces when broken. It is a common find in gravel pits, riverbeds, and desert regions worldwide, notably in the USA (Oregon/Idaho), India, and Brazil.