sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow with brown and grey patterns, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Cleavage: None, Specific gravity: 2.58-2.91

Hardness: 6

Identified June 28, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow with brown and grey patterns, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Cleavage: None, Specific gravity: 2.58-2.91

Formation & geological history

Formed via the deposition of silica-rich fluids in volcanic ash or sedimentary environments. The yellow coloration is caused by the presence of Goethite or other iron oxides. Geologically common from the Mesozoic to Cenozoic eras.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and in lapidary arts. Also popular as a healing stone in metaphysical practices.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. It is known as a stone of endurance and protection.

Field identification & locations

Identified in the field by its conchoidal fracture, high hardness (will scratch glass), and complete opacity. Commonly found in riverbeds or coastal areas in the western United States, India, and Madagascar.