Difference between revisions of "Vaterite"
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| + | [[File:Mindat_image_of_vaterite.jpg|thumb|Vaterite crystals<br>from Mindat [https://www.mindat.org/min-4161.html Vaterite]]] | ||
== Description == | == 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. | |
| − | A rare crystalline form of calcium carbonate. | ||
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
| Line 7: | Line 7: | ||
vaterite (Port.); Vaterit (Deut.) | vaterite (Port.); Vaterit (Deut.) | ||
| − | == | + | ==Physical and Chemical Properties== |
| − | |||
| − | |||
| − | Reacts with acids to evolve carbon dioxide | + | * Hexagonal crystal system. |
| + | * Reacts with acids to evolve carbon dioxide | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 17: | Line 16: | ||
! scope="row"| Composition | ! scope="row"| Composition | ||
| CaCO3 | | CaCO3 | ||
| + | |- | ||
| + | ! Morphology | ||
| + | | Thin fibers, spherulitic aggregates | ||
| + | |- | ||
| + | ! Color | ||
| + | | Colorless | ||
| + | |- | ||
| + | ! Streak | ||
| + | | White | ||
|- | |- | ||
! scope="row"| Mohs Hardness | ! scope="row"| Mohs Hardness | ||
| Line 22: | Line 30: | ||
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 2.54 | + | | 2.54 g/ml |
| + | |- | ||
| + | ! Refractive Index | ||
| + | | 1.550, 1.650 | ||
| + | |- | ||
| + | ! Birefringence | ||
| + | | 0.10 | ||
| + | |- | ||
|} | |} | ||
| − | == | + | ==Resources and Citations== |
| − | + | * Mindat: [https://www.mindat.org/min-4161.html Vaterite] Accessed April 2024 | |
| − | + | * R. Gettens, E. West Fitzhugh, R.Feller, "Calcium Carbonate Whites", ''Artists Pigments'', Vol. 2., A. Roy ed. Oxford University Press, Oxford, 1993. | |
| + | * Mineralogy Database: [http://www.webmineral.com/data/Vaterite.shtml Vaterite] | ||
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 11:33, 10 April 2024
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
- Mindat: Vaterite Accessed April 2024
- 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