sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)
Hardness: 6.5–7 on Mohs scale; Color: Yellow, mustard, or sandy brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture)
- Hardness
- 6
- Color
- Yellow, mustard, or sandy brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Yellow, mustard, or sandy brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture)
Formation & geological history
Formed through the accumulation of fine siliceous material in sedimentary environments, often associated with hydrothermal activity or volcanic ash that has become silicified over millions of years.
Uses & applications
Commonly used as a gemstone for jewelry, lapidary work, decorative cabochons, and as a popular stone for tumbling and collecting.
Geological facts
Yellow Jasper is known as a stone of endurance and protection. Its color is primarily derived from iron inclusions and it is often found as water-worn pebbles in riverbeds.
Field identification & locations
Identify in the field by its opaque nature (it does not transmit light even on thin edges), smooth waxy feel when polished, and its inability to be scratched by a steel knife.
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