sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Yellow to mustard-brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow to mustard-brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Yellow to mustard-brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, typically in marine or volcanic environments. Its yellow color comes from iron impurities such as goethite.
Uses & applications
Used primarily as a gemstone for jewelry (cabochons), ornamental carvings, stone seals, and as a popular specimen for lapidary collectors.
Geological facts
Jasper was a favorite gem in the ancient world, its name can be traced back to Arabic, Persian, Greek, and Latin. Yellow Jasper is often associated with the 'solar plexus' chakra in metaphysical traditions.
Field identification & locations
Identify in the field by its opacity (unlike translucent citrine), hardness, and characteristic conchoidal fracture. Often found in riverbeds or coastal areas where harder silicate rocks concentrate.
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