sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Iron Oxide impurities
Hardness: 6.5-7 on Mohs scale; Color: Yellow, mustard, or tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow, mustard, or tan
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Yellow, mustard, or tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica-rich volcanic ash or sediments where iron oxides are present to provide the yellow pigment. It typically occurs in hydrothermal veins or as nodules in sedimentary rocks.
Uses & applications
Used primarily in jewelry as cabochons or beads, for decorative carvings, as pocket stones for crystal healing, and as tumbled stones for collectors.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as a stone of protection and was often used in amulets by ancient civilizations.
Field identification & locations
Identify in the field by its opacity (unlike translucent citrine), conchoidal fracture, and smoothness after water erosion. Often found in riverbeds or coastal areas in the Western United States, Brazil, and Africa.
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