sedimentary
Yellow Jasper
Silicon Dioxide (SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Vitreous to 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: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None, Fracture: Conchoidal.
Formation & geological history
Forms from the deposition of silica from water solutions or volcanic ash, often in coastal or hydro-thermal environments. It is a dense, opaque variety of chalcedony.
Uses & applications
Commonly used for lapidary work, decorative cabochons, jewelry, beads, and as a popular shielding or healing stone in metaphysical practices.
Geological facts
The yellow color is typically caused by the presence of iron oxide (goethite) inclusions. It has been used since ancient times for amulets and seals.
Field identification & locations
Identify by its opacity (even on thin edges) compared to agate. It can be found in riverbeds and desert environments globally. Common locations include Africa, Brazil, and the USA.
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