sedimentary

Red Jasper (Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to waxy; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Opaque.

Hardness: 6
Color: Brick red to brownish-red
Luster: Dull to waxy

Identified July 3, 2026More sedimentary →

Explore Red Jasper (Chert) 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 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to waxy; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Opaque.

Formation & geological history

Formed from the deposition of silica-rich fluids in volcanic or sedimentary environments, often associated with hydrothermal activity. Over time, high pressure and temperature lithify these sediments into dense, opaque quartz.

Uses & applications

Used primarily as a decorative stone, in lapidary work for cabochons and beads, as an ornamental stone, and in 'healing' crystal practices.

Geological facts

Jasper has been used as a gemstone since antiquity; it was mentioned in various ancient cultures as a stone for protection. The presence of iron(III) oxide is what gives this specimen its characteristic red color.

Field identification & locations

Identify by its opacity (unlike translucent carnelian), its high hardness (it will scratch glass), and its smooth, waxy feel when weathered. Commonly found in riverbeds and desert environments.