sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91

Hardness: 6
Color: Mustard yellow to brownish-yellow
Luster: Vitreous to waxy

Identified June 25, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica in cavities of volcanic or sedimentary rocks. The yellow color is derived from high iron content (goethite or limonite). It is often found in riverbeds or alluvial deposits.

Uses & applications

Used in gemstone carvings, jewelry (cabochons), interior decoration, and as a popular specimen for lapidary collectors.

Geological facts

Jasper is known as the 'supreme nurturer' in metaphysical circles. Historically, yellow jasper was used in protection amulets. It is an opaque variety of chalcedony.

Field identification & locations

Identify in the field by its opaque nature (unlike translucent agate) and its smooth, waxy feel when wet. It will scratch glass but cannot be scratched by a steel knife. Common in the Western USA and India.