sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Mustard yellow, tan, or gold with brown veins; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture)

Hardness: 6
Color: Mustard yellow, tan, or gold with brown veins
Luster: Vitreous to waxy

Identified July 6, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Mustard yellow, tan, or gold with brown veins; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture)

Formation & geological history

Formed through the deposition of silica from water or volcanic ash, often in coastal or sedimentary environments where iron oxides (goethite) permeate the silica to provide color.

Uses & applications

Used primarily in lapidary work for cabochons, beads, and ornamental carvings. Also valued as a healing stone in metaphysical communities.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek 'iaspis', meaning 'spotted stone'. Yellow jasper specifically owes its color to hydrated iron oxide.

Field identification & locations

Identify in the field by its opacity (even when held to light), high hardness (won't scratch with a steel knife), and smooth, waxy surface when water-worn in riverbeds or beaches.