Bischofite: Difference between revisions

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|Crystal_Habit        =
|Crystal_Habit        =
|Twinning            =
|Twinning            =
|Refractive_Indices  =n<sub>x</sub> =1.494<br> n<sub>y</sub> = 1.507<br> n<sub>z</sub> = 1.528
|Refractive_Indices  =n<sub>x</sub> =1.495<br> n<sub>y</sub> = 1.509<br> n<sub>z</sub> = 1.528
|Birefringence        =Δ = 0.034
|Birefringence        =Δ = 0.003
|optical_Orientation  =positive
|optical_Orientation  =positive
|Pleochroism          =
|Pleochroism          =
|Dispersion          =
|Dispersion          =79°
|Phase_Transition    =
|Phase_Transition    =
|chemBehavior        =
|chemBehavior        =
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<biblist/>
<biblist/>
<bibprint citation="Dana:1951"/>


[[Category:Bischofite]][[Category:Chloride]][[Category:Salt]][[Category:InProgress]]
[[Category:Bischofite]][[Category:Chloride]][[Category:Salt]][[Category:InProgress]]

Revision as of 16:21, 13 February 2015

Bischofite[1][2] [3]
Mineralogical name Bischofite
Chemical name Magnesium chloride hexahydrate
Trivial name
Chemical formula MgCl2•6H2O
Other forms
Crystal system monoclinic
Crystal structure
Deliquescence humidity 20°C 33.1%
Solubility (g/l) at 20°C 543 g/l
Density (g/cm³) 1.57 g/cm3
Molar volume 129.6 cm3/mol
Molar weight 203.30 g/mol
Transparency transparent to translucent
Cleavage none
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments decomposes at 116-118°C
hygroscopic and deliquescent
Crystal Optics
Refractive Indices nx =1.495
ny = 1.509
nz = 1.528
Birefringence Δ = 0.003
Optical Orientation positive
Pleochroism
Dispersion 79°
Used Literature
{{{Literature}}}


back to Chloride

Hygroscopicity[edit]


Table 1: Deliquescence humidities of bischofite at different roud temperatures [Steiger.etal:2014]Title: Weathering and Deterioration
Author: Steiger, Michael; Charola A. Elena; Sterflinger, Katja
Link to Google Scholar
0°C 10°C 20°C 30°C 40°C 50°C
34.1%r.h. 33.7%r.h. 33.1%r.h. 32.4%r.h. 31.5%r.h. 30.5%r.h.


Weblinks[edit]

  1. http://webmineral.com/data/Bischofite.shtml viewed on 29/07/2010
  2. http://www.mindat.org/min-681.html viewed on 29/07/2010
  3. <bib id="Broul.etal:1981">

Literature[edit]

[Broul.etal:1981]Elsevier (eds.) Broul M., Nyvlt J.; Soehnel O. (1981): Solubility in organic two component systems, ElsevierLink to Google Scholar
[Dana:1951]Dana E.S. (eds.) Dana J.D. (1951): Dana's System of Mineralogy, 7, Wiley & SonsLink to Google Scholar
[Steiger.etal:2011a]Steiger, Michael; Linnow, Kirsten; Ehrhardt, Dorothee; Rohde, Mandy (2011): Decomposition reactions of magnesium sulfate hydrates and phase equilibria in the MgSO4-H2O and Na+-Mg2+-Cl--SO42--H2O systems with implications for Mars. In: Geochimica et Cosmochimica Act, 75 (12), 3600-3626, 10.1016/j.gca.2011.03.038,Link to Google Scholar
[Steiger.etal:2014]Steiger, Michael; Charola A. Elena; Sterflinger, Katja (2014): Weathering and Deterioration. In: Siegesmund S.; Snethlage R. (eds.): Stone in Architecture, Springer Verlag Berlin Heidelberg, 223-316, 10.1007/978-3-642-45155-3_4.Link to Google Scholar
[Dana:1951]Dana E.S. (eds.) Dana J.D. (1951): Dana's System of Mineralogy, 7, Wiley & SonsLink to Google Scholar