sedimentary
Banded Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
Hardness: 6.5-7 on Mohs scale; Color: Red, brown, yellow, and cream bands; Luster: Vitreous to waxy; Crystal structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Red, brown, yellow, and cream bands
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Red, brown, yellow, and cream bands; Luster: Vitreous to waxy; Crystal structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture).
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic or sedimentary environments, often found in ancient iron formations (BIFs) dating back over 2 billion years.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons), interior decoration, and as a popular collector's specimen due to its unique patterns.
Geological facts
Jasper is an opaque variety of chalcedony. The red coloring in banded jasper is typically caused by the oxidation of iron within the silica matrix.
Field identification & locations
Look for alternating bands of color and a smooth, waxy texture. It is commonly found in river beds or areas with ancient volcanic activity, especially in places like India, Brazil, and the USA.
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