sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
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
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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.
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