sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic or sedimentary environments, often associated with hydrothermal activity. The yellow color comes from the inclusion of goethite or iron hydroxides.
Uses & applications
Used primarily in lapidary work for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock tumbling and metaphysical collections.
Geological facts
Jasper is an opaque variety of chalcedony. It has been used since ancient times for seals and talismans, and yellow jasper specifically is often associated with protection and solar energy in folklore.
Field identification & locations
Identify by its opaque nature (unlike agate), smooth waxy texture when wet/polished, and high hardness. Commonly found in riverbeds and coastal areas worldwide, particularly in India, Russia, and the USA.
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