sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
Hardness: 6.5-7 Mohs; Color: Mustard yellow to brownish-yellow; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to brownish-yellow
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Mustard yellow to brownish-yellow; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic ash or sedimentary beds, with the yellow color derived from goethite or limonite inclusions.
Uses & applications
Used primarily as a decorative stone, in jewelry (cabs or beads), and as a landscape/river rock. Historically used for tools due to its hardness.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back in Hebrew, Assyrian, Persian, Greek, and Latin. Yellow jasper is specifically associated with protection and solar energy in metaphysical traditions.
Field identification & locations
Identify in the field by its opaque appearance, smooth water-worn texture, and inability to be scratched by a steel knife. Common in riverbeds and on beaches worldwide.
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