sedimentary

Yellow Jasper

Silicon dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to yellow-brown; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture.

Hardness: 6
Color: Mustard yellow to yellow-brown
Luster: Vitreous to dull

Identified June 27, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to yellow-brown; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture.

Formation & geological history

Formed from silica-rich fluids percolating through sedimentary or volcanic environments, often during the diagenesis of oceanic sediments. It is often found in prehistoric riverbeds.

Uses & applications

Used primarily for lapidary work, jewelry (cabochons), and as a healing stone in metaphysical communities. Historically used for making tools and arrowheads.

Geological facts

Jasper is an opaque variety of chalcedony. The yellow color is caused by the presence of iron inclusions, specifically goethite or limonite.

Field identification & locations

Identify by its opacity (even on thin edges), its yellow-mustard hue, and its inability to be scratched by a steel knife. Commonly found in riverbeds and pebbled beaches.