sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Limonite inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None, Fracture: Conchoisdal/Splintery

Hardness: 6

Identified May 21, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None, Fracture: Conchoisdal/Splintery

Formation & geological history

Formed through the deposition of silica from water-rich environments, often in volcanic ash beds or near hydrothermal veins where iron oxides (like goethite) permeate the silica during solidification.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons), interior decoration, and as a popular specimen for rock collectors and practitioners of crystal healing.

Geological facts

Jasper is an opaque variety of chalcedony. The yellow hue is almost always caused by tiny inclusions of iron hydroxide minerals. It has been used since antiquity for seals, amulets, and ornamentation across Egyptian and Minoan cultures.

Field identification & locations

Identify in the field by its hardness (will scratch glass), opaque nature, and smooth, waxy feel when wet or polished. Commonly found in riverbeds, desert regions, and areas with historic volcanic activity like the Oregon coast or Madagascar.