sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron inclusions
Hardness: 6.5-7 on Mohs scale. Color: Mustard yellow to golden brown. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal) microcrystalline. Specific Gravity: 2.6-2.9. Opaque.
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Mustard yellow to golden brown. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal) microcrystalline. Specific Gravity: 2.6-2.9. Opaque.
Formation & geological history
Formed via the accumulation of silica in sedimentary environments or hydrothermal veins. The yellow color is caused by the inclusion of iron hydroxides (Goethite) during the silica precipitation process over millions of years.
Uses & applications
Commonly used in jewelry as cabochons or beads, for decorative carvings, as tumbled stones for crystal healing, and as a popular specimen for rock collectors.
Geological facts
Jasper is an aggregate of microcrystalline quartz and chalcedony. In ancient times, Yellow Jasper was often used as a protective stone for spiritual and physical travel.
Field identification & locations
Identify by its characteristic mustard yellow color, smooth waxy surface when polished, and its inability to be scratched by a steel knife. It is frequently found in riverbeds or as nodules in volcanic or sedimentary rock layers.
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