sedimentary
Yellow Jasper
Cryptocrystalline Quartz (SiO2 with Iron inclusions)
Hardness: 6.5-7 Mohs; Color: Ocher, mustard yellow to brownish-gold; Luster: Dull to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Ocher, mustard yellow to brownish-gold
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Ocher, mustard yellow to brownish-gold; Luster: Dull to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture).
Formation & geological history
Forms when silica-rich fluids permeate sedimentary rocks or volcanic ash, with iron oxides providing the yellow coloration. It is often found as water-worn nodules in riverbeds.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and tumbled stones. Also popular as a decorative landscaping stone and a collector's specimen.
Geological facts
Yellow Jasper was historically used by diverse cultures as a stone of protection during spiritual travel. It owes its distinct yellow hue to the presence of goethite or limonite.
Field identification & locations
Identify in the field by its opaque nature (unlike translucent agate) and its hardness—it will scratch steel but cannot be scratched by it. Often found in gravel pits and beaches.
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