sedimentary
Yellow Jasper
Cryptocrystalline Quartz (SiO2 with Iron inclusion)
Hardness: 6.5-7 Mohs; Color: Mustard yellow, golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow, golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Mustard yellow, 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 accumulation of silica-rich fluids in volcanic or sedimentary environments, often associated with iron oxide staining which creates the yellow hue. It is frequently found as water-worn pebbles in riverbeds.
Uses & applications
Commonly used in lapidary work for making cabochons, beads, and ornamental carvings. It is also used in decorative gravel and collected as a gemstone for its aesthetic and perceived metaphysical properties.
Geological facts
Yellow Jasper is often called 'Yellow Jasp' or 'King's Gold' in ancient times. It has been used historically for thousands of years as a protective stone for travelers and spiritual protection.
Field identification & locations
Identified by its intense yellow/mustard color, opacity, and smooth, waxy surface when wet. It can be found globally but is common in river deposits and gravel pits. Collectors look for uniform color and lack of cracks.
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