Gypsum: Difference between revisions

Revision as of 15:28, 20 December 2011

Gypsum^[1]^[2]

Mineralogical name	Gypsum, Selenite
Chemical name	Calcium sulfate dihydrate
Trivial name	Gypsite, Sulfate of Lime
Chemical formula	Ca[SO₄]•2H₂O
Other forms	Anhydrite (CaSO₄) Hemihydrate (CaSO₄•0.5H₂O)
Crystal system	monoclinic
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C	2.14 g/l
Density (g/cm³)	2.2-2.4 g/cm³
Molar volume	74.69 cm³/mol
Molar weight	172.17g /mol
Transparency	transparent to opaque
Cleavage	perfect
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments	hardly soluble in water
Crystal Optics
Refractive Indices	α = 1.519-1.521 β = 1.522-1.523 γ = 1.529-1.530
Birefringence	Δ = 0.010
Optical Orientation	biaxial positive
Pleochroism
Dispersion	58°
Used Literature
{{{Literature}}}

back to Sulfate

@@ Line 10: / Line 10: @@
 |Crystal_Structure    =
 |Deliqueszenzhumidity =
-|Solubility           = 2,14 g/l
+|Solubility           = 2.14 g/l
-|Density              = 2,2-2,4 g/cm³
+|Density              = 2.2-2.4 g/cm³
-|MolVolume            = 74,69 cm<sup>3</sup>/mol
+|MolVolume            = 74.69 cm<sup>3</sup>/mol
-|Molweight            = 172,17g /mol
+|Molweight            = 172.17g /mol
 |Transparency         = transparent to opaque
 |Cleavage             = perfect
 |Crystal_Habit        =
 |Twinning             =
-|Refractive_Indices   = α = 1,519-1,521<br>β = 1,522-1,523<br>γ = 1,529-1,530
+|Refractive_Indices   = α = 1.519-1.521<br>β = 1.522-1.523<br>γ = 1.529-1.530
-|Birefringence        = Δ = 0,010
+|Birefringence        = Δ = 0.010
 |optical_Orientation  = biaxial positive
 |Pleochroism          =
@@ Line 28: / Line 28: @@
 }}
-back to [[Sulphate]]
+back to [[Sulfate]]
 ==  Weblinks ==
@@ Line 34: / Line 34: @@
 <references />
-[[Category:Gipsum]][[Category:Sulphate]][[Category:Salt]][[Category:InProgress]]
+[[Category:Gipsum]][[Category:Sulphate]][[Category:Salt]][[Category:InProgress]][[Category:Sulfate]]