Astrakanite: Difference between revisions
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Revision as of 08:19, 14 September 2011
| Astrakanite[1] | |
| |
| Mineralogical name | Astrakanite, Bloedite |
| Chemical name | Sodium magnesium sulphate |
| 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 = 1,483-1,486 ny = 1,486-1,488 nz = 1,487-1,489 |
| Birefringence | Δ = 0,004-0,003 |
| Optical Orientation | biaxial negative |
| Pleochroism | |
| Dispersion | |
| Used Literature | |
| {{{Literature}}} | |
back to Sulphate
Weblinks[edit]
- ↑ http://www.mindat.org/min-695.html viewed on 29/07/2010