Vaterite
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Description
A rare crystalline form of Calcium carbonate that is composed of at least two different coexisting crystallographic structures. The major form exhibits hexagonal symmetry, while the minor form occurs within the nanodomains of the major matrix. Vaterite can occur as a biomineral in fish often formed by the dehydration of amorphous Calcium carbonate.
Synonyms and Related Terms
vaterite (Port.); Vaterit (Deut.)
Physical and Chemical Properties
- Hexagonal crystal system.
- Reacts with acids to evolve carbon dioxide
| Composition | CaCO3 |
|---|---|
| Morphology | Thin fibers, spherulitic aggregates |
| Color | Colorless |
| Streak | White |
| Mohs Hardness | 3 |
| Density | 2.54 g/ml |
| Refractive Index | 1.550, 1.650 |
| Birefringence | 0.10 |
Resources and Citations
- R. Gettens, E. West Fitzhugh, R.Feller, "Calcium Carbonate Whites", Artists Pigments, Vol. 2., A. Roy ed. Oxford University Press, Oxford, 1993.° Mineralogy Database: Vaterite