sedimentary

Yellow Jasper

Jasper (Silicon Dioxide with Iron Hydroxide impurities, SiO2 + FeO(OH))

AI-generated identification · may be incorrect

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

Identified June 20, 2026More sedimentary →

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Physical properties

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.