Fossil Coral
What is Fossil Coral?
Fossil Coral is a gemstone formed when ancient coral is gradually replaced with agate, jasper, or chalcedony over millions of years. This process preserves the intricate patterns of the coral, resulting in beautiful, unique designs. It is found in various colors, often with striking patterns that showcase the coral's original structure. The gem is highly valued for its historical significance and aesthetic appeal, making it a popular choice for jewelry and decorative items.
Optical Properties
- Refractive Index
- 1.544-1.553
- Birefringence
- 0.009
- Pleochroism
- None
- Optical Character
- Uniaxial positive
- Dispersion
- 0.013
Discover Values
Fossil Coral Market Value Calculator
Estimate the market value of Fossil Coral using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Fossil Coral Localities Map
See where Fossil Coral is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- White, gray, black, brown, red, yellow, and orange
- Hardness (Mohs)
- 6.5-7
- Density
- 2.6-2.7 g/cm ³
- Luster
- Vitreous to Dull
- Crystal System
- Hexagonal
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- Si, O
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