sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Yellow to mustard-brown; Luster: Dull to vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Yellow to mustard-brown
Luster: Dull to vitreous

Identified March 14, 2026More sedimentary →

Explore 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 (Mohs scale); Color: Yellow to mustard-brown; Luster: Dull to vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91.

Formation & geological history

Usually formed when silica-rich fluids permeate through volcanic ash or sedimentary rocks, often occurring in hydrothermal veins or as nodules in volcanic rocks from various geological ages.

Uses & applications

Primarily used as a gemstone for jewelry, cabochons, and beads. Also used in ornamental carvings, as a healing crystal in metaphysical circles, and for decorative masonry.

Geological facts

Jasper is an opaque variety of chalcedony. The yellow color is typically caused by the presence of goethite or limonite. Historically, it has been referred to as a 'protective stone' by various cultures.

Field identification & locations

Identify in the field by its opaque nature (unlike translucent agate), conchoidal fracture, and extreme hardness—it cannot be scratched by a steel knife. Common in the western USA, India, and Madagascar.