sedimentary

Red and Yellow Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Red and yellow earthy tones; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91

Hardness: 6
Color: Red and yellow earthy tones
Luster: Vitreous to dull

Identified July 11, 2026More sedimentary →

Explore Red and Yellow 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: Red and yellow earthy tones; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine sediments. The red and yellow colors are produced by varying levels of iron oxide (hematite) and iron hydroxide (goethite) impurities.

Uses & applications

Commonly used for lapidary work, jewelry (beads and cabochons), ornamental carvings, and as a popular specimen for rock collectors.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone. It has been used by humans for thousands of years for both decoration and tools.

Field identification & locations

Identify by its opaque nature, waxy or earthy luster, and conchoidal fracture. Often found in areas with ancient volcanic activity or riverbeds. It will not scratch with a pocket knife.