Calcite: Difference between revisions
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== Abstract == | == Abstract == | ||
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== Occurrence of calcite<br> == | == Occurrence of calcite<br> == | ||
Calcium carbonate as a natural mineral occurs in the form of calcite and aragonite. Apart from these two modifications, the unstable modification vaterite can be detected in bone, but transforms into calcite under normal conditions. | Calcium carbonate as a natural mineral occurs in the form of calcite and aragonite. Apart from these two modifications, the unstable modification vaterite can be detected in bone, but transforms into calcite under normal conditions. | ||
Calcspar is a very pure deposit of calcium carbonate. Calcium carbonate as a binder for mortars or paints can be of organic and inorganic origin. A special characteristic of calc-spar, the strong birefringence was discovered and scientifically explained by C. Huygens in the 17th century.<br><br> | |||
== Information concerning the damage potential and weathering activity of calcite == | == Information concerning the damage potential and weathering activity of calcite == | ||
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== Microscopy<br> == | == Microscopy<br> == | ||
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== X-ray diffraction == | == X-ray diffraction == | ||
Revision as of 21:30, 27 February 2012
Authors: Hans-Jürgen Schwarz , Nils Mainusch
back to Carbonate
| Calcite[1][2] | |
| |
| Mineralogical name | Calcite |
| Chemical name | Calcium carbonate |
| Trivial name | Calc spar |
| Chemical formula | CaCO3 |
| Other forms | CaCO3•H2O CaCO3•6H2O |
| Crystal system | trigonal |
| Crystal structure | |
| Deliquescence humidity 20°C | |
| Solubility (g/l) at 20°C | 0.014 g/l (25°C) |
| Density (g/cm³) | 2.72 g/cm3 |
| Molar volume | |
| Molar weight | 100.09 g/mol |
| Transparency | transparent to opaque |
| Cleavage | perfect |
| Crystal habit | |
| Twinning | |
| Phase transition | |
| Chemical behavior | |
| Comments | well soluble in 2M HCl |
| Crystal Optics | |
| Refractive Indices | no = 1.658 ne = 1.486 |
| Birefringence | Δ = 0.172 |
| Optical Orientation | negative |
| Pleochroism | |
| Dispersion | |
| Used Literature | |
| {{{Literature}}} | |
| This article will be released soon. |
Calcite in Pictures[edit]
Under the scanning electron microscope (SEM)[edit]
Calcite crystals on a sample plate
Weblinks
[edit]
- ↑ http://webmineral.com/data/Calcite.shtml viewed on 09/06/2011
- ↑ http://www.mindat.org/min-859.html viewed on 09/06/2011
Literatur[edit]
| [Stark.etal:1996] | Stark, Jochen; Stürmer, Sylvia (1996): Bauschädliche Salze, Bauhaus-Univ. Weimar |  |