Epsomite: Difference between revisions

Revision as of 15:55, 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	n_x = 1.433 n_y = 1.455 n_z = 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

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

Table 1:Deliqueszenz points and temperature [after [Arnold.etal:1991]**Title:** *Monitoring Wall Paintings Affected by soluble Salts*
**Author:** *Arnold, Andreas; Zehnder, Konrad*
]
10°C	20°C	25°C	30°C
86,9% r.F.	90,1% r.F.	88,3% r.F.	88,0% r.F.

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

@@ Line 66: / Line 66: @@
 Die geringe Hygroskopizität des Reinsalzes Epsomit, die in dem hohen Wert der Gleichgewichtsfeuchte im Bereich 88-90 % r.F. deutlich wird, kann nicht isoliert betrachtet werden. In Mischsystemen, d.h. unter dem Einfluss von Fremdionen, liegt der Sorptionspunkt tiefer (siehe Tab.). Die Möglichkeit der hygroskopischen Feuchteaufnahme mit den damit verbundenen Problematiken ist trotz des hohen Deliqueszenzpunktes durchaus gegeben. <br>
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-[[file:MgSO4_a.jpg|thumb|350px|right|'''Figure 2:''' The system MgSO<sub>4</sub>/H<sub>2</sub> form -30°C to 80°C , (Diagram: Michael Steiger)]]
+[[file:MgSO4_a.jpg|thumb|350px|left|'''Figure 1:''' The system MgSO<sub>4</sub>/H<sub>2</sub> form -30°C to 80°C , (Diagram: Michael Steiger)]]
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