sedimentary
Yellow Jasper
Silicon Dioxide (SiO2)
Hardness: 6.5-7 Mohs; Color: Mustard yellow to golden brown; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 Mohs; Color: Mustard yellow to golden brown; Luster: Vitreous to dull; Crystal structure: Trigonal (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, often during the oxidation of iron within the microcrystalline quartz structure.
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative carvings, and as a popular stone for tumbling and collecting.
Geological facts
Jasper is an opaque variety of chalcedony. The yellow color is specifically caused by the presence of Goethite or other iron oxides/hydroxides.
Field identification & locations
Identified by its waxy to earthy luster, complete opacity, and inability to be scratched by a steel knife. Common locations include South Africa, Brazil, India, and the USA.
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