Epsomite: Difference between revisions

From Saltwiki
Jump to navigation Jump to search
Line 194: Line 194:
<gallery caption="Crystallized from a water solution on a glass slide " widths="200px" heights="150px" perrow="3">
<gallery caption="Crystallized from a water solution on a glass slide " widths="200px" heights="150px" perrow="3">


Image:0141 0010 Bb440um 0021.JPG|Sampole of a salt crust of magnesium sulfate whiskers
Image:0141 0010 Bb440um 0021.JPG|Sample of a salt crust of magnesium sulfate whiskers
Image:CeS 221209-02-10x-01.JPG|Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide
Image:CeS 221209-02-10x-01.JPG|Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide
Image:CeS 221209-02-10x-02.JPG|Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide  
Image:CeS 221209-02-10x-02.JPG|Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide  
Line 200: Line 200:
Image:CeS 221209-04-2,5kx-02.JPG|Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide   
Image:CeS 221209-04-2,5kx-02.JPG|Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide   
Image:CeS 221209-04-2,5kx-03.JPG|Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide  
Image:CeS 221209-04-2,5kx-03.JPG|Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide  
Image:MGSO4 4.5.2006 (11).JPG|Magnesium- ulfate, crystallized from a water solution on a glass slide  
Image:MGSO4 4.5.2006 (11).JPG|Magnesium- sulfate, crystallized from a water solution on a glass slide  
Image:MGSO4 4.5.2006 (12).JPG|Magnesium sulfate, crystallized from a water solution on a glass slide  
Image:MGSO4 4.5.2006 (12).JPG|Magnesium sulfate, crystallized from a water solution on a glass slide  
Image:MGSO4 4.5.2006 (3).JPG|Magnesium sulfate, crystallized from a water solution on a glass slide  
Image:MGSO4 4.5.2006 (3).JPG|Magnesium sulfate, crystallized from a water solution on a glass slide  

Revision as of 17:30, 12 January 2012

Epsomite[1][2]
HJS MgSO4 092503-2.jpg
Mineralogical name Epsomite
Chemical name Magnesiumsulfate Heptahydrate
Trivial name Bitter Salts, Reichardtite, Seelandite
Chemical formula MgSO4•7H2O
Other forms Kieserite (MgSO4•H2O)
Sanderite (MgSO4•2H2O)
Starkeyite (MgSO4•4H2O)
Pentahydrite(MgSO4•5H2O)
Hexahydrite (MgSO4•6H2O)
Meridianite (MgSO4•11H2O)
Magnesium 12-Hydrate
Crystal system orthorhombic
Crystal structure
Deliquescence humidity 20°C 90.1% (20°C), 94% (30°C)
Solubility (g/l) at 20°C 710 g/l
Density (g/cm³) 146.8 cm3/mol
Molar volume 246.48 g/mol
Molar weight 1.67 g/cm3
Transparency transparent to translucent
Cleavage perfect
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments can by produced from an aqueous solution under 50°C
Crystal Optics
Refractive Indices nx = 1.433
ny = 1.455
nz = 1.461
Birefringence Δ = 0.028
Optical Orientation biaxial negative
Pleochroism
Dispersion
Used Literature
{{{Literature}}}


<bibimport/> Authors: Hans-Jürgen Schwarz, Tim Müller, Nils Mainusch
back to Sulfate

Hygroscopicity[edit]

Figure 1: The system MgSO4/H2 form -30°C to 80°C , (Diagram: Michael Steiger)


Table 1:Deliquescence points at different temperatures [after [Arnold.etal:1991]Title: Monitoring Wall Paintings Affected by soluble Salts
Author: Arnold, Andreas; Zehnder, Konrad
Link to Google Scholar]
10°C 20°C 25°C 30°C
86,9% r.F. 90,1% r.F. 88,3% r.F. 88,0% r.F.


Sorption of moisture[edit]

Tabele 2: Behavior concerning moisture sorption of magnesium sulfate [after [Vogt.etal:1993]Title: Der Einfluss hygroskopischer Salze auf die Gleichgewichtsfeuchte und Trocknung anorganischer Baustoffe
Author: Vogt, R.; Goretzki, Lothar
Link to Google Scholar]
Moisture sorption at 87%r.F. 81%r.F. 70%r.F. 61%r.F. 50%r.F.
MgSO4 76 75 70 71 27
MgSO4 + NaCl
(1:1 molare mixture) 		240 146 75 50 20


Salts and deteriotion pattern[edit]

On objects[edit]

Under the polarising microscope[edit]

  • Crystallized from a water solution on a glass slide
  • Sample of a salt crust of magnesium sulfate whiskers

    Sample of a salt crust of magnesium sulfate whiskers

  • Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide

    Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide

  • Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide

    Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide

  • Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide

    Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide

  • Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide

    Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide

  • Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide

    Real sample with magnesium sulfate salts, crystallized from a water solution on a glass slide

  • Magnesium- sulfate, crystallized from a water solution on a glass slide

    Magnesium- sulfate, crystallized from a water solution on a glass slide

  • Magnesium sulfate, crystallized from a water solution on a glass slide

    Magnesium sulfate, crystallized from a water solution on a glass slide

  • Magnesium sulfate, crystallized from a water solution on a glass slide

    Magnesium sulfate, crystallized from a water solution on a glass slide

  • Magnesium sulfate, crystallized from a water solution on a glass slide

    Magnesium sulfate, crystallized from a water solution on a glass slide

  • Magnesium sulfate, crystallized from a water solution on a glass slide

    Magnesium sulfate, crystallized from a water solution on a glass slide

  • Magnesium sulfate, crystallized from a water solution on a glass slide

    Magnesium sulfate, crystallized from a water solution on a glass slide

  • Magnesium sulfate, crystallized from a water solution on a glass slide

    Magnesium sulfate, crystallized from a water solution on a glass slide

  • Magnesium sulfate, crystallized from a water solution on a glass slide

    Magnesium sulfate, crystallized from a water solution on a glass slide


Weblinks[edit]

  1. ↑ http://webmineral.com/data/Epsomite.shtml seen on 29.072010
  2. ↑ http://www.mindat.org/min-1393.html seen on 29.072010

A phase is a physically distinctive form of matter and is characterized by having relatively uniform chemical and physical properties.

Retrieved from "https://saltwiki.net/index.php?title=Epsomite&oldid=3012"