sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Mustard yellow, ochre, brown; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow, ochre, brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow, ochre, 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 sediment. The yellow color is primarily due to the presence of goethite or other iron hydroxide inclusions. It can date back to various geological periods, often found in Precambrian formations.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and decorative carvings. It is also popular in the metaphysical community and used occasionally for architectural accents.
Geological facts
Jasper is referred to as the 'Supreme Nurturer'. In ancient times, it was believed to protect travelers and provide spiritual grounding. The distinct banding or mottling seen in this specimen is typical of sedimentary silica deposits.
Field identification & locations
Identify in the field by its opaque nature (unlike agate which is translucent), its smooth waxy feel when water-worn, and its inability to be scratched by a steel knife. Common in riverbeds and desert environments worldwide, notably in the USA, India, and South Africa.
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