Carnelian
What is Carnelian?
Carnelian is a translucent, orange to red variety of chalcedony, a cryptocrystalline form of silica. Its color is due to the presence of iron oxide impurities. It is a relatively hard and durable gemstone, often used in jewelry and carvings.
Optical Properties
- Refractive Index
- 1.544-1.553
- Birefringence
- None
- Pleochroism
- None
- Optical Character
- Isotropic
- Dispersion
- Low
Carnelian Market Value Calculator
Estimate the market value of Carnelian using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Carnelian Localities Map
See where Carnelian is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Map preview
North ZoneCentral RidgeSouth Basin
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© Marie-Lan Nguyen
Quick Facts
Physical Properties
- Color
- Orange, Red, Brownish-red
- Hardness (Mohs)
- 6.5 to 7
- Density
- 2.58 to 2.64 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- Silicon, Oxygen, Iron
Also Known As
CarnelianCornelianSard
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