sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with high iron inclusion
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to pale golden, Luster: Vitreous to dull/waxy, Crystal structure: Trigonal (microcrystalline quartz), Specific gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to pale golden, Luster: Vitreous to dull/waxy, Crystal structure: Trigonal (microcrystalline quartz), Specific gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of fine volcanic ash or silica-rich sediment that crystallizes over millions of years. This specimen shows water-worn rounding, likely from a fluvial or beach environment.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and tumbling. Also used historically for ornamentation and as an ornamental architectural stone.
Geological facts
Jasper is an opaque variety of chalcedony. The yellow hue is primarily due to the presence of goethite or other iron hydroxide minerals embedded within the silica matrix.
Field identification & locations
Identify in the field by its opacity (unlike translucent quartz), waxy texture when wet, and inability to be scratched by a steel knife. Frequently found in gravel beds or beaches near volcanic regions.
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