sedimentary
Banded Jasper
Microcrystalline Quartz (SiO2) with iron inclusions
Hardness: 6.5-7 on Mohs scale. Color: Reddish-brown with tan or yellow banding. Luster: Dull to vitreous/waxy. Crystal structure: Trigonal (microcrystalline). Opaque.
- Hardness
- 6
- Color
- Reddish-brown with tan or yellow banding
- Luster
- Dull to vitreous/waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Reddish-brown with tan or yellow banding. Luster: Dull to vitreous/waxy. Crystal structure: Trigonal (microcrystalline). Opaque.
Formation & geological history
Formed when volcanic ash or fine silica-rich sediment was permeated by silica-rich fluids. The banding is caused by variations in the concentration of impurities, primarily iron oxides, during the deposition process.
Uses & applications
Commonly used for lapidary work, jewelry (cabochons), talismans, and as a collector's specimen. Its hardness makes it suitable for polishing.
Geological facts
The name 'Jasper' originates from the Greek word 'iaspis', meaning 'spotted stone'. Jasper specimens can be over 3 billion years old and are often associated with Banded Iron Formations.
Field identification & locations
Identify by its smooth, conchoidal fracture and lack of transparency. Common in the Western United States, Australia, and Brazil. Collectors should look for distinct, sharp banding patterns.
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