Epsomite: Difference between revisions
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===Sorption of moisture=== | ===Sorption of moisture=== | ||
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|+''Tabele 2: Behavior concerning moisture sorption of magnesium sulfate [after bib id=Vogt.etal:1993/>]'' | |+''Tabele 2: Behavior concerning moisture sorption of magnesium sulfate [after <bib id=Vogt.etal:1993/>]'' | ||
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|bgcolor = "#F0F0F0"| '''Moisture sorption at''' | |bgcolor = "#F0F0F0"| '''Moisture sorption at''' | ||
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== Salts and deteriation pattern == | == Salts and deteriation pattern == | ||
=== | === On objects === | ||
=== Under the | === Under the polarising microscope === | ||
Revision as of 15:57, 26 December 2011
| Epsomite[1][2] | |
| |
| 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]
| 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]
| 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 deteriation pattern[edit]
On objects[edit]
Under the polarising microscope[edit]
- Crystallized from a water solution on a glass slide
Sampole 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
Kieserite-crystals
Kieserite-crystals
Kieserite-crystals
Kieserite-crystals
Kieserite-crystals
Kieserite-crystals
Magnesium- ulfate, 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
.JPG)
.JPG)
.JPG)
Weblinks[edit]
- ↑ http://webmineral.com/data/Epsomite.shtml seen on 29.072010
- ↑ http://www.mindat.org/min-1393.html seen on 29.072010