Sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

AI-generated identification · may be incorrect

Hardness: 6.5–7 (Mohs); Color: Yellow to mustard-gold; Luster: Dull/Waxy; Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91

Hardness: 6
Color: Yellow to mustard-gold
Luster: Dull/Waxy

Identified March 21, 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); Color: Yellow to mustard-gold; Luster: Dull/Waxy; Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91

Formation & geological history

Formed through the accumulation of fine-grained silica in sedimentary environments or hydrothermal veins. The yellow color is caused by the inclusion of hydrated iron oxide minerals like goethite.

Uses & applications

Commonly used in lapidary work for cabochons, beads, and ornamental carvings. Also popular in the metaphysical community and for landscaping aggregate.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it was used by ancient civilizations for making tools/weapons due to its hardness and ability to hold a sharp edge when fractured.

Field identification & locations

Identify in the field by its opacity (unlike translucent agate) and its hardness—it will scratch glass but cannot be scratched by a steel knife. Commonly found as water-worn pebbles on beaches and in riverbeds.