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Coral

Coral cabochon
(kor'- ol')

17th c.; lat. corallum, gr. korallion, sem. goral

Very hard calcareous skeleton secreted by polyp colonies, animals from warm seas, used in jewelry
Color
Light to dark tones of red to orange red
Family
Corallium Rubrum , Nobile or Japonicum
Chemical composition
Mainly CaCO3
Crystal system
Aggregate of calcium carbonate
Hardness (Mohs scale)
3,5 - 4
Specific gravity
2,65 ±0,05
Refractive index
1,486 - 1,658
Birefringence
Not seen
Optical character
None (aggregate)
Chanthaburi

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Jaipur

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