sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to dark ocher; Luster: Vitreous to waxy; Crystal structure: Hexagonal (Trigonal); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to dark ocher
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to dark ocher; Luster: Vitreous to waxy; Crystal structure: Hexagonal (Trigonal); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of fine-grained silica particles in volcanic ash or sedimentary environments. Its yellow color is derived from iron silicate or goethite impurities trapped during crystallization.
Uses & applications
Commonly used for lapidary work, cabochons, beads, decorative carvings, and as a pocket stone for collection or metaphysical purposes.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone.' It has been used by ancient civilizations for seals and talismans for over 5,000 years.
Field identification & locations
Identify in the field by its opacity (will not let light through even at the edges), its smooth conchoidal fracture, and inability to be scratched by a steel pocketknife. Often found in riverbeds or coastal deposits.
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