sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to sandy gold with creamy banding; Luster: Vitreous to waxy; Crystal structure: Microcrystalline (Trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.6 - 2.8.

Hardness: 6
Color: Mustard yellow to sandy gold with creamy banding
Luster: Vitreous to waxy

Identified March 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from silica-rich groundwater that percolates through volcanic ash or sediment, carrying iron oxide minerals that provide the yellow pigment. Most specimens range from late Mesozoic to Cenozoic eras.

Uses & applications

Commonly used as a semi-precious gemstone in jewelry (pendants, beads), lapidary work for cabochons, and ornamental decorative objects. Highly valued in metaphysical communities as a 'stone of protection'.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it was used by ancient civilizations for seal stones and amulets. The 'yellow' specifically comes from goethite or limonite inclusions.

Field identification & locations

Identify by its matte to waxy appearance when polished and its inability to be scratched by a steel blade. Found extensively in the Western United States (Oregon, Idaho), South Africa, and Madagascar. Collectors look for unique banding or 'picture' patterns.

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