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
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Fossil Coral before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
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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Fossil Coral FAQs
How do I identify Fossil Coral?
Fossil Coral can be identified by its hardness of 6.5-7 on the Mohs scale, White color, Vitreous to Dull luster, Hexagonal crystal system. Look for these key characteristics when examining specimens.
What color is Fossil Coral?
Fossil Coral typically appears in White, gray, black, brown, red, yellow, and orange. Color can vary depending on impurities and formation conditions.
How hard is Fossil Coral?
Fossil Coral has a hardness of 6.5-7 on the Mohs scale. This gives it moderate hardness.