sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with impure Iron inclusions
Hardness: 6.5-7 (Mohs); Color: Pale yellow to mustard yellow; Luster: Vitreous to greasy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Pale yellow to mustard yellow
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Pale yellow to mustard yellow; Luster: Vitreous to greasy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed from silica-rich fluids permeating through sedimentary rocks or volcanic ash. The distinct yellow color comes from the inclusion of iron oxides (goethite). It can be found in deposits ranging from the Precambrian to recent geological eras.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a popular specimen for crystal collecting and metaphysical practices.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone'. In ancient times, yellow jasper was often used as a protective talisman for travelers.
Field identification & locations
Identify by its opaque quality, waxy feel when polished, and lack of visible crystals. It is commonly found in India, South Africa, Madagascar, and the United States. Collectors look for consistent color saturation and unique banding patterns.
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