sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with goethite or limonite inclusions
Hardness: 6.5-7.0 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
Formation & geological history
Formed through the deposition of silica-rich solutions in sedimentary environments or volcanic ash beds. The yellow color is derived from iron oxides, specifically goethite and limonite, trapped during mineralization over millions of years.
Uses & applications
Commonly used in lapidary work for making cabochons, beads, and tumbled stones. It is also a popular specimen for crystal healing practitioners and geological collectors.
Geological facts
Yellow Jasper has a long history of use as a protective stone for travelers. It is an opaque variety of chalcedony that gets its distinct patterns and colors from high mineral impurity content.
Field identification & locations
Identifiable in the field by its opacity, smooth conchoidal fracture, and inability to be scratched by a steel knife. It is frequently found in riverbeds and desert environments throughout the Western United States and India.
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