sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron inclusions
Hardness: 6.5-7 (Mohs scale); Color: Yellow-gold to mustard brown; Luster: Dull to waxy; Crystal Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow-gold to mustard brown
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Yellow-gold to mustard brown; Luster: Dull to waxy; Crystal Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the process of mineralization of silica-rich fluids in volcanic ash or sedimentary environments. The yellow coloration is caused by the inclusion of iron hydroxides like goethite during formation.
Uses & applications
Used primarily for jewelry (cabochons, beads), decorative carvings, lapidary art, and as a healing stone in metaphysical practices.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as a stone of protection and was often used in the amulets of ancient Egyptians.
Field identification & locations
Identify in the field by its smooth, waxy texture when broken and its inability to be scratched by a steel knife. It is commonly found in river beds or as weathered nodules in desert environments.
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