sedimentary
Yellow Jasper
Jasper (Silicon Dioxide with Iron Hydroxide impurities, SiO2 + FeO(OH))
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Dull to vitreous/waxy, Crystal structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Dull to vitreous/waxy, Crystal structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
Formation & geological history
Formed through the deposition of silica-rich water in sedimentary environments, often near volcanic activity where geothermal fluids circulate. The yellow hue comes from goethite or other iron oxides mixed with the cryptocrystalline quartz.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and carvings. Also used as an ornamental stone and occasionally in industrial applications as a grinding medium due to its hardness.
Geological facts
Jasper was a favorite gem in ancient times and is mentioned in the Bible. It is known as the 'supreme nurturer' in metaphysical circles. Yellow jasper specifically gets its color from iron and clay inclusions.
Field identification & locations
Identify in the field by its smooth, shell-like (conchoidal) fracture, lack of transparency when held to light, and its ability to scratch glass. Common in the Western United States, Brazil, and South Africa.
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