Gypsum: Difference between revisions
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Image:Perleberg 14.04.2003 (50)-Ausschnitt.jpg| | Image:Perleberg 14.04.2003 (50)-Ausschnitt.jpg|Salt damage on a brick, St. Jakobi Church, Perleberg | ||
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Image:Per_270603_5-13_14.jpg|Brick with gypsum caused damage, St. Jakobi Perleberg | Image:Per_270603_5-13_14.jpg|Brick with gypsum caused damage, St. Jakobi Church, Perleberg | ||
Image:Per_270603_5-13_15.jpg|Brick with gypsum caused damage, St. Jakobi Perleberg | Image:Per_270603_5-13_15.jpg|Brick with gypsum caused damage, St. Jakobi Church, Perleberg | ||
Image:Eilsum_Gips_duennschliff.jpg | Image:Eilsum_Gips_duennschliff.jpg|Gypsum crystals between plater layers | ||
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Image:SG2-2.jpeg | Gypsum crystals in a SEM | Image:SG2-2.jpeg | Gypsum crystals in a SEM | ||
Image:SG2-3.jpg | Gypsum crystals in a SEM | Image:SG2-3.jpg | Gypsum crystals in a SEM | ||
Image:SG3-SPC2.jpeg | | Image:SG3-SPC2.jpeg |EDX spektra of gypsum crystals in a SEM | ||
Image:SG3-3.jpeg | Gypsum crystals in a SEM | Image:SG3-3.jpeg | Gypsum crystals in a SEM | ||
Revision as of 16:26, 26 December 2011
<bibimport/>
| 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}}} | |
Authors: Hans-Jürgen Schwarz , Nils Mainusch, Tim Müller
back to Sulfate
Calciumsulfate and Gipsum[edit]
Solubility properties[edit]
Author: Stark, Jochen; Stürmer, Sylvia
)Photos of gypsum crystals and deterioration pattern caused by gypsum[edit]
On a object[edit]
Salt damage on a brick, St. Jakobi Church, Perleberg
-Ausschnitt.jpg)
Under the polarising microscope[edit]
- In thin section of bricks
Brick with gypsum caused damage, St. Jakobi Church, Perleberg
Brick with gypsum caused damage, St. Jakobi Church, Perleberg
Gypsum crystals between plater layers
- Gypsum crystallized out of a solution in water on a glass slide
Calcium sulfate crystallized out of a solution in water on a glass slide
Calcium sulfate with sodium chloride of a real sample, Gypsum crystallized out of a solution in water on a glass slide
Calcium sulfate with sodium chloride of a real sample, Gypsum crystallized out of a solution in water on a glass slide
Calcium sulfate, Gypsum crystallized out of a solution in water on a glass slide
Under the Scanning Electron Microscope (SEM)[edit]
- In a SEM
Gypsum crystals in a SEM
Gypsum crystals in a SEM
Gypsum crystals in a SEM
EDX spektra of gypsum crystals in a SEM
Gypsum crystals in a SEM
Gypsum crystals in a SEM
Gypsum crystals in a SEM
EDX spektra of gypsum crystals in a SEM
Weblinks[edit]
- ↑ http://webmineral.com/data/Gypsum.shtml seen on 30.07.2010
- ↑ http://www.mindat.org/min-1784.html seen on 30.07.2010
Literatur[edit]
[Filter missing]