Alum-(Na)
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| Alum-(Na) | |
|---|---|
| General | |
| Category | Sulfate minerals, alum series |
| Chemical formula | NaAl(SO4)2·12H2O |
| Strunz classification | 07.CC.20 |
| Dana classification | 29.5.5.2 |
| Crystal symmetry | 2/m 3 |
| Z | 4 |
| Identification | |
| Molar mass | 458.28 g/mol |
| Color | colorless |
| Crystal system | Cubic |
| Mohs scale hardness | 3 |
| Luster | vitreous |
| Streak | white |
| Diaphaneity | transparent |
| Density | 1.67 g/cm3 |
| Refractive index | n = 1.4388 |
| Solubility | soluble |
| References | [1][2][3] |
Alum-(Na), also known as sodium alum, is a sulfate mineral, one of the alum series, with formula NaAl(SO4)2·12H2O. It is a hydrated form of sodium aluminium sulfate.
The name alum-(Na) was introduced by the Commission on New Minerals and Mineral Names (CNMMN) of the International Mineralogical Association (IMA) in 2008, as part of a move to have single words (with hyphenated suffixes as necessary) for all mineral names.[4]
References
- ↑ Alum-(Na), <http://webmineral.com/data/Alum-%28Na%29.shtml> (accessed 28 November 2009), WebMineral.com.
- ↑ Alum-(Na), <http://www.mindat.org/show.php?id=3703> (accessed 28 November 2009), MinDat.org.
- ↑ Cromer, D. T.; Kay, M. I.; Larson, A. C. Refinement of the alum structures. II. X-ray and neutron diffraction of NaAl(SO4)2·12H2O, γ-alum. Acta Crystallogr. 1967, 22 (2), 182–87. DOI: 10.1107/S0365110X67000313.
- ↑ Burke, Ernst A.J. Tidying up mineral names: an IMA-CNMNC scheme for suffixes, hyphens and diacritical marks. Mineralogical Record 2008, 39 (2), 131–35, <http://pubsites.uws.edu.au/ima-cnmnc/tidyingupnames.pdf>.
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