sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to golden brown; Luster: Dull to waxy; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to golden brown; Luster: Dull to waxy; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic ash or sedimentary layers. The yellow color comes from the inclusion of iron-based minerals like goethite or limonite during the petrification process.
Uses & applications
Commonly used as a gemstone for jewelry (cabochons), ornamental stone carving, and in many cultures for spiritual or metaphysical collection.
Geological facts
Jasper is an opaque variety of chalcedony. Yellow jasper specifically is sometimes called mustard jasper and has been used since antiquity for its supposed protective qualities.
Field identification & locations
Identify by its waxy luster, smoothness when polished, and high hardness (it cannot be scratched by a steel knife). Commonly found in riverbeds or near ancient volcanic sites globally, notably in India, Brazil, and the USA.
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