sedimentary
Yellow Jasper
Silicon dioxide (SiO2)
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to yellow-brown; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture.
- Hardness
- 6
- Color
- Mustard yellow to yellow-brown
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to yellow-brown; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed from silica-rich fluids percolating through sedimentary or volcanic environments, often during the diagenesis of oceanic sediments. It is often found in prehistoric riverbeds.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons), and as a healing stone in metaphysical communities. Historically used for making tools and arrowheads.
Geological facts
Jasper is an opaque variety of chalcedony. The yellow color is caused by the presence of iron inclusions, specifically goethite or limonite.
Field identification & locations
Identify by its opacity (even on thin edges), its yellow-mustard hue, and its inability to be scratched by a steel knife. Commonly found in riverbeds and pebbled beaches.
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