sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown with reddish zones; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to golden brown with reddish zones
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown with reddish zones; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water or within volcanic ash and sedimentary rocks. These nodules are often tumbled and smoothed by river or tidal action over millions of years.
Uses & applications
Commonly used in jewelry (beads, cabochons), lapidary art, and as decorative pocket stones or metaphysical healing stones.
Geological facts
Jasper is an opaque variety of chalcedony. The yellow coloring is typically caused by goethite or iron oxide inclusions. It was historically considered a stone of protection and endurance.
Field identification & locations
Identify by its opacity, hardness (will scratch glass), and smooth, waxy surface when wet. Commonly found in river beds, deserts, and coastal areas globally, notably in the USA, India, and Africa.
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