Astrakanite: Difference between revisions
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|Footnote = <ref>http://www.mindat.org/min-695.html viewed on 29/07/2010</ref> | |Footnote = <ref>http://www.mindat.org/min-695.html viewed on 29/07/2010</ref> | ||
|photo = [[File:CH GR Berguen EvKirche 0098 01 6 Bb 440um IMG 3337.JPG|300px]] | |photo = [[File:CH GR Berguen EvKirche 0098 01 6 Bb 440um IMG 3337.JPG|300px]] | ||
|mineralogical_Name = Astrakanite, | |mineralogical_Name = Astrakanite, Bloedite | ||
|chemical_Name = Sodium magnesium sulfate | |chemical_Name = Sodium magnesium sulfate | ||
|Trivial_Name = | |Trivial_Name = | ||
Revision as of 16:50, 14 February 2015
| Astrakanite[1] | |
| |
| 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 | |
| [Dana:1951]Title: Dana's System of Mineralogy Author: Dana J.D.  [JCPDS:1991]Title: JCPDS Powder Diffraction File 2 (PDF-2)
| |
back to Sulfate
References[edit]
- ↑ http://www.mindat.org/min-695.html viewed on 29/07/2010
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). | |