Banded Chert
What is Banded Chert?
Banded Chert is a sedimentary rock composed primarily of microcrystalline or cryptocrystalline quartz (silica). It is characterized by its distinct bands or layers of varying colors, which are formed by the deposition of silica-rich materials in ancient marine or lacustrine environments. The banding is a result of changes in the composition or the conditions of deposition over time. The rock is known for its fine-grained texture and can exhibit a range of colors, including shades of gray, brown, red, and black, depending on the presence of impurities.
Optical Properties
- Refractive Index
- Approximately 1.54 to 1.55
- Birefringence
- Typically, chert exhibits very low birefringence due to its microcrystalline structure.
- Pleochroism
- Not typically observed in chert.
- Optical Character
- Typically uniaxial or isotropic.
- Dispersion
- Not typically specified for chert.
Banded Chert Market Value Calculator
Estimate the market value of Banded Chert using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Banded Chert Localities Map
See where Banded Chert is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Varies widely, including gray, brown, red, black, and combinations thereof, often in bands or layers.
- Hardness (Mohs)
- 6.5 - 7
- Density
- 2.60 - 2.65 g/cm³
- Streak
- White to colorless
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- Silicon (Si), Oxygen (O), and trace elements depending on impurities.
Also Known As
Identify Banded Chert Instantly
- Snap a photo, get instant results
- 6,700+ rocks, minerals & crystals
- Discover collecting spots near you