sedimentary
Yellow Jasper
Cryptocrystalline Quartz (SiO2)
Hardness: 6.5-7 Mohs; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None/Conchoidal fracture.
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed via the precipitation of silica from groundwater in sedimentary environments or volcanic ash beds. Typically lacks the translucency of agate due to high iron oxide content.
Uses & applications
Commonly used in lapidary for cabochons, beads, and pocket stones. Historically used for ornaments and seal stones.
Geological facts
Yellow Jasper is often called 'The Stone of Protection' in metaphysical circles. Its color comes from finely dispersed goethite or limonite inclusions.
Field identification & locations
Identify by its smooth, opaque, waxy surface and its ability to scratch glass. Common in riverbeds, gravel deposits, and desert regions like the American Southwest.
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