Astrakanite: Difference between revisions
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==Weblinks== | ==Weblinks== | ||
Revision as of 14:48, 20 December 2011
| 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 = 1.483-1.486 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 Sulfate
Weblinks[edit]
- ↑ http://www.mindat.org/min-695.html viewed on 29/07/2010