sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to ochre; Luster: Dull to waxy; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to ochre
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to ochre; Luster: Dull to waxy; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed from fine-grained silica-rich sediments or volcanic ash that undergoes silicification over millions of years. Its yellow color is derived from iron impurities, typically goethite or limonite, present during the consolidation process.
Uses & applications
Primarily used as a semi-precious gemstone in jewelry, for decorative items, and as a popular palm stone for collectors and metaphysical practitioners.
Geological facts
Yellow Jasper was traditionally used in ancient civilizations like Egypt and among Native American tribes as a protective stone. It is a dense, opaque variety of chalcedony.
Field identification & locations
Identify in the field by its opacity (it will not let light through even at the edges, unlike agate), its smooth river-worn texture, and its ability to scratch glass. Commonly found in riverbeds and desert environments globally, notably in the USA, India, and Madagascar.
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