mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Iron Oxides
Hardness: 6.5-7 on the Mohs scale; Color: Yellow, mustard, tan, reddish-brown; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline (trigonal); Cleavage: None, conchoidal fracture; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow, mustard, tan, reddish-brown
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on the Mohs scale; Color: Yellow, mustard, tan, reddish-brown; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline (trigonal); Cleavage: None, conchoidal fracture; Specific Gravity: 2.58-2.91
Formation & geological history
Forms when silica-rich thermal waters precipitate microcrystalline quartz within cavities or sedimentary deposits, absorbing iron oxide minerals (goethite/limonite) which give it its yellow hue.
Uses & applications
Used extensively for lapidary arts, tumbled stones, jewelry beads, cabochons, and decorative carvings.
Geological facts
Yellow Jasper has been used since antiquity for seals and amulets. It is believed by traditional practitioners to provide grounding and protective energies.
Field identification & locations
Identified by its opaque appearance, waxy polish, smooth surface, and resistance to scratching by a steel blade. Commonly found along riverbeds, beaches, and gravel deposits worldwide.
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