Aphthitalite: Difference between revisions
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|Refractive_Indices = n<sub>o</sub> = 1,487-1,491<br> n<sub>e</sub> = 1,492-1,499 | |Refractive_Indices = n<sub>o</sub> = 1,487-1,491<br> n<sub>e</sub> = 1,492-1,499 | ||
|Birefringence = Δ = 0,005-0,008 | |Birefringence = Δ = 0,005-0,008 | ||
|optical_Orientation = | |optical_Orientation = positive | ||
|Pleochroism = | |Pleochroism = | ||
|Dispersion = | |Dispersion = | ||
Revision as of 09:17, 7 July 2011
| Aphthitalite[1][2] | |
| |
| Mineralogical name | Aphthitalite |
| Chemical name | Potassium sodium sulphate |
| Trivial name | Glaserite, Vesuvian Salt |
| Chemical formula | K3Na(SO4)2 Na2SO4•3K2SO4 |
| Other forms | |
| Crystal system | trigonal |
| Crystal structure | |
| Deliquescence humidity 20°C | |
| Solubility (g/l) at 20°C | |
| Density (g/cm³) | 2,7 g/cm3 |
| Molar volume | 246,2 cm3/mol |
| Molar weight | 332 g/mol |
| Transparency | transparent to opaque |
| Cleavage | imperfect to fair |
| Crystal habit | |
| Twinning | |
| Phase transition | |
| Chemical behavior | |
| Comments | |
| Crystal Optics | |
| Refractive Indices | no = 1,487-1,491 ne = 1,492-1,499 |
| Birefringence | Δ = 0,005-0,008 |
| Optical Orientation | positive |
| Pleochroism | |
| Dispersion | |
| Used Literature | |
| {{{Literature}}} | |
back to Sulphate
Weblinks[edit]
- ↑ http://webmineral.com/data/Aphthitalite.shtml viewed on 29/07/2010
- ↑ http://www.mindat.org/min-280.html viewed on 29/07/2010