sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Yellow, mustard, ochre; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Yellow, mustard, ochre
Luster: Vitreous to waxy

Identified July 13, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Yellow, mustard, ochre; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica-rich fluids in volcanic or sedimentary environments. Its yellow color is derived from high iron content. These formations can be millions of years old.

Uses & applications

Used primarily in jewelry, lapidary arts for cabochons and tumbled stones, and as a decorative stone in spiritual or metaphysical practices.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it was known as a stone of endurance and protection. The name means 'spotted or speckled stone'.

Field identification & locations

Identify by its opacity (it does not transmit light even on thin edges), its yellow-to-brown earthy tone, and its high hardness which prevents scratching by steel blades. Commonly found in riverbeds or coastal areas.