sedimentary

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Yellow, mustard, ochre, or earthy gold; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Yellow, mustard, ochre, or earthy gold
Luster: Vitreous to waxy

Identified March 25, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Yellow, mustard, ochre, or earthy gold; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica from mineral-rich fluids in hydrothermal veins or sedimentary environments. The yellow color is primarily caused by iron oxide inclusions (goethite/limonite).

Uses & applications

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

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it was known as a stone of protection and was often used in ancient amulets and cylinder seals in Mesopotamia.

Field identification & locations

Identify in the field by its opacity (it will not let light pass through like agate), smooth conchoidal fracture, and inability to be scratched by a steel knife. Found globally, especially in riverbeds or volcanic regions of the Western USA and India.