sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7.0 (Mohs); Color: Mustard yellow to golden brown with black dendrites or veins; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal) microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to golden brown with black dendrites or veins
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7.0 (Mohs); Color: Mustard yellow to golden brown with black dendrites or veins; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal) microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or sedimentary beds, often during the late stages of hydrothermal activity. Its yellow color is derived from iron (goethite or limonite) content.
Uses & applications
Used primarily in lapidary work for cabochons, beads, and decorative carvings. It is popular in the metaphysical community as a stone for protection and social clarity.
Geological facts
Yellow jasper is a microcrystalline variety of quartz. Throughout history, it has been used as a 'rain stone' and a talisman for travelers. It is often found in massive form rather than distinct crystals.
Field identification & locations
Identify in the field by its opaque nature, lack of cleavage, and ability to scratch glass. It is commonly found in areas of volcanic activity or ancient seabed deposits; notable locations include South Africa, India, and the USA (Oregon and Idaho).
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