Mirabilite: Difference between revisions

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[[Category:Mirabilite]][[Category:Sulfate]][[Category:Salt]][[Category:InProgress]][[Category:Sulfate]]
[[Category:Mirabilite]][[Category:Sulfate]][[Category:Salt]][[Category:InProgress]][[Category:Sulphate]]

Revision as of 16:46, 17 February 2012

Authors: Hans-Jürgen Schwarz, Nils Mainusch, NN....
English version by Christa Gerdwilker
back to back to Sulfate

Mirabilite[1][2]
HJS Na2SO4-slides-110703-10x-1.jpg
Mineralogical name Mirabilite
Chemical name Sodium sulfate decahydrate
Trivial name Glauber salt, Reussin, Sulphate of Soda
Chemical formula Na2SO4•10H2O
Other forms Sodium sulphate heptahydrate Na2SO4•7H2O
Crystal system monoclinic
Crystal structure
Deliquescence humidity 20°C 93.6% (20°C), 90% (23°C), 87% (25°C)
Solubility (g/l) at 20°C 900 g/l
Density (g/cm³) 1.464 g/cm³
Molar volume 219.8 cm3/mol
Molar weight 322.21 g/mol
Transparency transparent to opaque
Cleavage perfect
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments soluble in water and glycerin,
not soluble in pure alcohol
easily loses some water, converts to thenardite at 32°C
abnormal blue or brown interference colors
Crystal Optics
Refractive Indices nx = 1.395
ny = 1.396-1.410
nz = 1.398-1.419
Birefringence Δ = 0.04-0.023
Optical Orientation negative
Pleochroism
Dispersion
Used Literature
{{{Literature}}}


Solubility properties[edit]

Figure1: Solubility of thenardite and mirabilite in comparison to other salts[after [Stark.etal:1996]Title: Bauschädliche Salze
Author: Stark, Jochen; Stürmer, Sylvia
Link to Google Scholar
].


Under the polarizing microscope[edit]

Weblinks
[edit]

Literatur[edit]

[Dana:1951]Dana E.S. (eds.) Dana J.D. (1951): Dana's System of Mineralogy, 7, Wiley & SonsLink to Google Scholar
[Robie.etal:1978]Robie R.A., Hemingway B.S.; Fisher J.A. (1978): Thermodynamic properties of minerals and related substances at 298.15 K and 1 bar pressure and higher temperatures. In: U.S. Geol. Surv. Bull, 1452 ()Link to Google Scholar
[Steiger.etal:2008]Steiger, Michael; Asmussen, Sönke (2008): Crystallization of sodium sulfate phases in porous materials: The phase diagram Na2SO4–H2O and the generation of stress. In: Geochimica et Cosmochimica Acta, 72 (17), 4291-4306, UrlLink to Google Scholar
[Vogt.etal:1993]Vogt, R.; Goretzki, Lothar (1993): Der Einfluss hygroskopischer Salze auf die Gleichgewichtsfeuchte und Trocknung anorganischer Baustoffe, unveröffentlichter Bericht.Link to Google Scholar