Gypsum: Difference between revisions

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|Footnote            = <ref>http://webmineral.com/data/Gypsum.shtml seen on 30.07.2010</ref><ref>http://www.mindat.org/min-1784.html seen on 30.07.2010</ref>
|Footnote            = <ref>http://webmineral.com/data/Gypsum.shtml seen on 30.07.2010</ref><ref>http://www.mindat.org/min-1784.html seen on 30.07.2010</ref>
|photo                = SA101 1.jpeg|300px
|photo                = SA101 1.jpeg|300px
|mineralogical_Name  = Gipsum, Selenite
|mineralogical_Name  = Gypsum, Selenite
|chemical_Name        = Calcium sulphate dihydrate
|chemical_Name        = Calcium sulphate dihydrate
|Trivial_Name        = Gypsite, Sulphate of Lime
|Trivial_Name        = Gypsite, Sulphate of Lime
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back to [[Sulphate]]
back to [[Sulphate]]
== Salt and salt-induced damages  ==
=== on objects  ===
<gallery caption="" widths="200px" heights="150px" perrow="3">
Image:Perleberg 14.04.2003 (50)-Ausschnitt.jpg|brick damged by gipsum, St. Jakobi Perleberg
Image:|
Image:|
</gallery>
<br clear=all>
=== under the polarising microscope  ===
<gallery caption="thin-section samples" widths="200px" heights="150px" perrow="3">
Image:Per_270603_5-13_14.jpg|brick damged by gipsum, St. Jakobi Perleberg
Image:Per_270603_5-13_15.jpg|brick damged by gipsum, St. Jakobi Perleberg
Image:Eilsum_Gips_duennschliff.jpg
</gallery>
<gallery caption="aqueous solution crystallised on a glass slide" widths="200px" heights="150px" perrow="3">
Image:CaSO4 pol 400x 01.JPG|Gipsum, crystallised from an aqueous solution on a glass slide
Image:CaSO4+NaCl reale Probe 01.JPG|Gipsum with Natriumchloride in a real sample, crystallised from an aqueous solution on a glass slide
Image:CaSO4+NaCl reale Probe 02.JPG|Gipsum with Natriumchloride in a real sample, crystallised from an aqueous solution on a glass slide
Image:HJS CaSO4 092503-1.jpg|Gipsum, crystallised from an aqueous solution on a glass slide
</gallery>
<br clear=all>
== Under the polarising microscope  ==
<gallery caption="SEM" widths="200px" heights="150px" perrow="3">
Image:SA100_1.jpg | Gipsum crystals in the SEM
Image:SG2-2.jpeg | Gipsum crystals in the SEM
Image:SG2-3.jpg | Gipsum crystals in the SEM
Image:SG3-SPC2.jpeg | Gipsum crystals in the SEM
Image:SG3-3.jpeg | Gipsum crystals in the SEM
Image:SG3-4.jpeg | Gipsum crystals in the SEM
Image:SG1-5.jpeg | Gipsum crystals in the SEM
Image:SG1-SPC.jpeg | EDX spectrum of gypsum in the SEM
</gallery>
<br clear=all>


==  Weblinks ==
==  Weblinks ==

Revision as of 14:48, 3 June 2011

Gypsum[1][2]
SA101 1.jpeg
Mineralogical name Gypsum, Selenite
Chemical name Calcium sulphate dihydrate
Trivial name Gypsite, Sulphate of Lime
Chemical formula Ca[SO4]•2H2O
Other forms Anhydrite (CaSO4)
Hemihydrate (CaSO4•0,5H2O)
Crystal system {{{Crystal_System}}}
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C
Density (g/cm³) 2,2-2,4 g/cm³
Molar volume 74,69 cm3/mol
Molar weight 172,17g /mol
Transparency
Cleavage
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments
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 Sulphate

Weblinks[edit]

  1. ↑ http://webmineral.com/data/Gypsum.shtml seen on 30.07.2010
  2. ↑ http://www.mindat.org/min-1784.html seen on 30.07.2010

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

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