sedimentary

Red Jasper

Silicon Dioxide (SiO2 with Hematite inclusions)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: reddish-brown to deep brick red; Luster: dull to vitreous/waxy; Crystal structure: Microcrystalline/Trigonal; Cleavage: none (conchoidal fracture).

Hardness: 6
Color: reddish-brown to deep brick red
Luster: dull to vitreous/waxy

Identified July 21, 2026More sedimentary →

Explore Red Jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6.5-7 on Mohs scale; Color: reddish-brown to deep brick red; Luster: dull to vitreous/waxy; Crystal structure: Microcrystalline/Trigonal; Cleavage: none (conchoidal fracture).

Formation & geological history

Formed as silica-rich fluids permeate fine-grained sedimentary or volcanic rocks, absorbing iron oxides (hematite) which impart the characteristic deep red hue. Common in ancient microcrystalline sedimentary deposits worldwide.

Uses & applications

Used primarily in lapidary work, jewelry, decorative carvings, tumbling, and as a popular rock collecting specimen.

Geological facts

Red jasper has been used since antiquity for seals, amulets, and ornamental objects. Its red color is directly caused by fine inclusions of iron oxide (hematite).

Field identification & locations

Identify by its opaque red tone, smooth microcrystalline texture, hardness that scratches glass, and conchoidal fracture pattern. Commonly found along riverbeds, beaches, and quartz veins.