sedimentary
Yellow Jasper
Chalcedony (SiO2) with iron inclusions
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Dull/Waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None, Fracture: Conchoidal.
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Dull/Waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None, Fracture: Conchoidal.
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, frequently during the Cenozoic or Mesozoic eras. The yellow color is caused by the presence of goethite or limonite (iron oxides).
Uses & applications
Commonly used for tumbled stones, decorative ornaments, gemstone beads in jewelry, and metaphysical practices for 'grounding'.
Geological facts
Jasper is an opaque form of chalcedony. Historically, it was known as a stone of endurance and protection. Specimens with patterns are often called 'Picture Jasper'.
Field identification & locations
Identify by its opacity (it will not let light through, unlike agate), its hardness (it should scratch glass), and its smooth but non-translucent surface. Commonly found in riverbeds or coastal deposits.
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