Astrakanite: Difference between revisions
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|Crystal_Habit = | |Crystal_Habit = | ||
|Twinning = | |Twinning = | ||
|Refractive_Indices = n<sub>x</sub> = 1.483 | |Refractive_Indices = n<sub>x</sub> = 1.483<br> n<sub>y</sub> = 1.486<br> n<sub>z</sub> = 1.487 | ||
|Birefringence = Δ = 0.004 | |Birefringence = Δ = 0.004 | ||
|optical_Orientation = biaxial negative | |optical_Orientation = biaxial negative | ||
|Pleochroism = | |Pleochroism = | ||
|Dispersion = | |Dispersion =0.71° | ||
|Phase_Transition = | |Phase_Transition = | ||
|chemBehavior = | |chemBehavior = | ||
| Line 36: | Line 36: | ||
<biblist/> | <biblist/> | ||
<bibprint citation="Dana:1951"/> | |||
[[Category:Astrakanite]][[Category:Sulphate]][[Category:Salt]][[Category:editing]][[Category:Sulfate]] | [[Category:Astrakanite]][[Category:Sulphate]][[Category:Salt]][[Category:editing]][[Category:Sulfate]] | ||
Revision as of 15:44, 13 February 2015
| Astrakanite[1] [2] | |
| |
| Mineralogical name | Astrakanite, Bloedite |
| Chemical name | Sodium magnesium sulfate |
| Trivial name | |
| Chemical formula | Na2Mg(SO4)2•4H2O |
| Other forms | |
| Crystal system | monoclinic |
| Crystal structure | |
| Deliquescence humidity 20°C | |
| Solubility (g/l) at 20°C | |
| Density (g/cm³) | 2.23 g/cm3 |
| Molar volume | 150.0 cm3/mol |
| Molar weight | 334.48 g/mol |
| Transparency | transparent |
| Cleavage | none observed |
| Crystal habit | |
| Twinning | |
| Phase transition | |
| Chemical behavior | |
| Comments | |
| Crystal Optics | |
| Refractive Indices | nx = 1.483 ny = 1.486 nz = 1.487 |
| Birefringence | Δ = 0.004 |
| Optical Orientation | biaxial negative |
| Pleochroism | |
| Dispersion | 0.71° |
| Used Literature | |
| {{{Literature}}} | |
back to Sulfate
References[edit]
- ↑ http://www.mindat.org/min-695.html viewed on 29/07/2010
- ↑ <bib id="JCPDS:1991">
Literature[edit]
| [Dana:1951] | Dana E.S. (eds.) Dana J.D. (1951): Dana's System of Mineralogy, 7, Wiley & Sons |  |
| [JCPDS:1991] | (1991): JCPDS Powder Diffraction File 2 (PDF-2). | |
| [Dana:1951] | Dana E.S. (eds.) Dana J.D. (1951): Dana's System of Mineralogy, 7, Wiley & Sons | |