sedimentary
Yellow Jasper
Chalcedony (SiO2)
Hardness: 6.5–7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Vitrous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Vitrous to waxy
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Vitrous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91
Formation & geological history
Formed from the deposition of silica from water containing high iron oxide impurities within volcanic or sedimentary environments. It is often found in prehistoric riverbeds or hydrothermal veins.
Uses & applications
Commonly used in jewelry (beads, cabochons), ornamental carvings, stone mosaics, and as a popular stone for tumbling and crystal collections.
Geological facts
Yellow Jasper was historically used as a protective talisman by ancient civilizations. Because it is an opaque variety of chalcedony, its color is permanent and will not fade in sunlight like citrine.
Field identification & locations
Identify in the field by its waxy luster, smoothness, and complete opacity (light will not pass through the center). Commonly found in the Western USA, Brazil, and India. Collectors value smooth, water-worn 'river pebbles' or stones with interesting patterns.
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