sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown with reddish zones; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Mustard yellow to golden brown with reddish zones
Luster: Vitreous to waxy

Identified April 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water or within volcanic ash and sedimentary rocks. These nodules are often tumbled and smoothed by river or tidal action over millions of years.

Uses & applications

Commonly used in jewelry (beads, cabochons), lapidary art, and as decorative pocket stones or metaphysical healing stones.

Geological facts

Jasper is an opaque variety of chalcedony. The yellow coloring is typically caused by goethite or iron oxide inclusions. It was historically considered a stone of protection and endurance.

Field identification & locations

Identify by its opacity, hardness (will scratch glass), and smooth, waxy surface when wet. Commonly found in river beds, deserts, and coastal areas globally, notably in the USA, India, and Africa.