sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

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

Identified June 20, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the infiltration of silica-rich waters into sedimentary rocks or volcanic ash, with the yellow color derived from iron-oxide inclusions like goethite. Often found as nodules or vein-filling material.

Uses & applications

Used primarily in lapidary work for cabochons, beads, and ornemental carvings; also highly valued in metaphysical communities for collection.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone, though yellow jasper is often more uniform in color.

Field identification & locations

Identify by its hardness (cannot be scratched by a knife), opaque transparency, and smooth, waxy surface. Look in river beds and desert environments worldwide, especially in India, South Africa, and the USA.