sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Vitreous to dull, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.58–2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Vitreous to dull, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.58–2.91
Formation & geological history
Formed from microcrystalline quartz that has been permeated by iron-rich sedimentary fluids or volcanic ash fluids. Its yellow coloring is typically due to the presence of goethite or limonite. It can be found in various geological ages.
Uses & applications
Commonly used in jewelry as cabochons, for lapidary art, as a decorative stone, and in spiritual/metaphysical practices. Historically used for making tools due to its hardness and fracture pattern.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'jasper' means 'spotted or speckled stone,' and yellow jasper has been used since antiquity by many cultures as a protection stone during travel.
Field identification & locations
Identify by its smooth, waxy feel and opaque, mustard-yellow color. It will scratch glass but cannot be scratched by a steel knife. It is commonly found in riverbeds and on beaches in regions like Brazil, Egypt, and the USA.
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