sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with goethite or iron oxide inclusions
Hardness: 6.5-7 (Mohs), Color: Mustard yellow to golden brown, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Mustard yellow to golden brown, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica from water-rich environments where iron compounds oxidize to create the distinct yellow hue. Often found in proximity to volcanic activity or hydrothermal veins as secondary replacements.
Uses & applications
Primarily used for lapidary work, jewelry (beads, cabochons), tumbled stones for crystal healing collections, and small decorative carvings.
Geological facts
Jasper is a variety of chalcedony that is opaque due to the high mineral content of its impurities. Historically, it was used by ancient civilizations for protective amulets and seals.
Field identification & locations
Identified in the field by its opacity (even on thin edges), smooth waxy feel when polished, and resistance to scratching from a steel blade. Common locations include India, South Africa, and the USA.
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