sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
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
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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.
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