sedimentary
Banded Jasper with Hematite or Quartz
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7.0 (Mohs scale), Color: Red, brown, white, and black bands. Luster: Vitreous to dull. Crystal Structure: Hexagonal (microcrystalline). Opaque with a conchoidal fracture.
- Hardness
- 6
- Color
- Red, brown, white, and black bands
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: Red, brown, white, and black bands. Luster: Vitreous to dull. Crystal Structure: Hexagonal (microcrystalline). Opaque with a conchoidal fracture.
Formation & geological history
Formed through the accumulation of silica in hydrothermal veins or as a chemical precipitate in sedimentary environments, often associated with iron-rich deposits. This specimen appears to be of Precambrian or Paleozoic origin.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and decorative carvings. It is also a popular collector's specimen and used in landscaping or as aquarium stone.
Geological facts
The vibrant red color is typically caused by iron (hematite) inclusions within the cryptocrystalline quartz structure. Banded varieties are often found in iron formations known as BIFs (Banded Iron Formations).
Field identification & locations
Identify in the field by its hardness (cannot be scratched by a steel knife), smooth waxy feel when wet, and distinct colorful banding. Found globally in areas with ancient seafloor sedimentary deposits.
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