sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow, yellowish-brown, golden brown; Luster: Waxy to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow, yellowish-brown, golden brown
- Luster
- Waxy to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow, yellowish-brown, golden brown; Luster: Waxy to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.58-2.91
Formation & geological history
Formed when fine silica-rich fluids permeate sediments, volcanic ash, or clay, accumulating iron oxide (goethite/limonite) impurities that give it its yellow color.
Uses & applications
Used for making cabochons, lapidary carvings, tumbled stones, decorative ornaments, and widely collected as a semi-precious gemstone.
Geological facts
Yellow jasper has been used since antiquity for seals and amulets. Its yellow hue is mainly due to the presence of hydrated iron oxide minerals mixed in the silica matrix.
Field identification & locations
Look for a dense, opaque microcrystalline texture with a smooth waxy luster and conchoidal fracture. Found in stream beds, volcanic regions, and sedimentary deposits globally including Brazil, India, Madagascar, and the USA.
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