sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)

AI-generated identification · may be incorrect

Hardness: 6.5–7 on Mohs scale; Color: Yellow, mustard, or sandy brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture)

Hardness: 6
Color: Yellow, mustard, or sandy brown
Luster: Vitreous to waxy

Identified May 31, 2026More sedimentary →

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Physical properties

Hardness: 6.5–7 on Mohs scale; Color: Yellow, mustard, or sandy brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture)

Formation & geological history

Formed through the accumulation of fine siliceous material in sedimentary environments, often associated with hydrothermal activity or volcanic ash that has become silicified over millions of years.

Uses & applications

Commonly used as a gemstone for jewelry, lapidary work, decorative cabochons, and as a popular stone for tumbling and collecting.

Geological facts

Yellow Jasper is known as a stone of endurance and protection. Its color is primarily derived from iron inclusions and it is often found as water-worn pebbles in riverbeds.

Field identification & locations

Identify in the field by its opaque nature (it does not transmit light even on thin edges), smooth waxy feel when polished, and its inability to be scratched by a steel knife.