sedimentary
Yellow Jasper
Chalcedony (SiO2 with iron impurities)
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to brownish-yellow with white quartz banding; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to brownish-yellow with white quartz banding
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to brownish-yellow with white quartz banding; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water solutions into fissures or cavities in volcanic or sedimentary rocks. The yellow coloration is caused by the inclusion of iron oxides (goethite). It can be found in various geological layers from ancient Precambrian to more recent eras.
Uses & applications
Primarily used for ornamental purposes such as cabochons, beads for jewelry, tumbled stones for collectors, and decorative carvings. It is also a popular stone in metaphysical circles.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone. It has been used by ancient civilizations for seals, amulets, and talismans for thousands of years.
Field identification & locations
Identify in the field by its hardness (will scratch glass), opaque nature, and smooth, waxy feel when water-worn. Common in riverbeds, beaches, and desert regions worldwide, particularly in India, Russia, and the USA (Pacific Northwest).
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