sedimentary

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Deep earthen red to brownish-red; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Deep earthen red to brownish-red
Luster: Dull to waxy

Identified July 1, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Deep earthen red to brownish-red; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the accumulation of silica in sedimentary environments or hydrothermal veins, where iron oxide (hematite) provides the opaque red pigmentation.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons and beads), pocket stones, and decorative carvings.

Geological facts

In antiquity, red jasper was known as a 'bringer of courage' and was often used in amulets by Egyptians and Native Americans. It is an opaque variety of chalcedony.

Field identification & locations

Identify by its opaque red color, smooth waxy feel when polished, and inability to be scratched by a steel knife. It is frequently found in riverbeds and arid regions globally.