sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale. Color: Mustard yellow to golden brown. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal) microcrystalline. Specific Gravity: 2.6-2.9. Opaque.

Hardness: 6
Color: Mustard yellow to golden brown
Luster: Vitreous to waxy

Identified June 2, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 on Mohs scale. Color: Mustard yellow to golden brown. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal) microcrystalline. Specific Gravity: 2.6-2.9. Opaque.

Formation & geological history

Formed via the accumulation of silica in sedimentary environments or hydrothermal veins. The yellow color is caused by the inclusion of iron hydroxides (Goethite) during the silica precipitation process over millions of years.

Uses & applications

Commonly used in jewelry as cabochons or beads, for decorative carvings, as tumbled stones for crystal healing, and as a popular specimen for rock collectors.

Geological facts

Jasper is an aggregate of microcrystalline quartz and chalcedony. In ancient times, Yellow Jasper was often used as a protective stone for spiritual and physical travel.

Field identification & locations

Identify by its characteristic mustard yellow color, smooth waxy surface when polished, and its inability to be scratched by a steel knife. It is frequently found in riverbeds or as nodules in volcanic or sedimentary rock layers.