sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Hardness: 6.5-7 Mohs scale; Color: Mustard yellow, tan, brown; Luster: Vitreous to waxy (especially when polished); Crystal Structure: Microcrystalline (trigonal); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Mustard yellow, tan, brown
Luster: Vitreous to waxy (especially when polished)

Identified July 10, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich waters into sedimentary or volcanic rock. As the silica settles, it traps microscopic iron minerals which provide the yellow hues. Often found in riverbeds or marine environments.

Uses & applications

Commonly used as a gemstone for jewelry (cabochons), ornamental decoration, tumble-polishing for collectors, and in metaphysical practices.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' originates from the Greek word 'iaspis', meaning 'spotted stone'. It was highly prized in the ancient world for both its beauty and perceived protective qualities.

Field identification & locations

Identify by its opacity (even on thin edges), smooth conchoidal fracture, and inability to be scratched by a steel knife. Commonly found in riverbeds, beaches, and desert plains globally.

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