sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with hydrated iron oxide impurities
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Fracture: Conchoidal
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Fracture: Conchoidal
Formation & geological history
Formed through the accumulation of fine-grained silica in sedimentary environments or hydrothermal veins. The yellow color is caused by the inclusion of iron-rich goethite. These specimens can range in age from millions to hundreds of millions of years.
Uses & applications
Used primarily in lapidary work for making cabochons, beads, and pocket stones. It is also a popular collector's item and used in metaphysical practices as a grounding stone.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone.' Yellow Jasper was historically used by diverse cultures as a stone of protection during spiritual travel and physical journeying.
Field identification & locations
Identify in the field by its opaque nature (unlike agate), smooth waxy feel, and characteristic conchoidal fracture (shell-like curves). Commonly found in riverbeds or desert regions of South Africa, Brazil, and the Western United States.
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