Thenardite
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| Thenardite[1][2] | |
| |
| Mineralogical name | Thenardite |
| Chemical name | Sodiumulphate |
| Trivial name | Pyrotechnite |
| Chemical formula | Na2SO4 |
| Other forms | Mirabilite (Na2SO4•10H2O) Sodiumsulphate heptahydrate (Na2SO4•7H2O) |
| Crystal system | orthorhombic |
| Crystal structure | |
| Deliquescence humidity 20°C | 81,7% (25°C) |
| Solubility (g/l) at 20°C | 162 g/l |
| Density (g/cm³) | 2,689 g/cm³ |
| Molar volume | 53,11 cm3/mol |
| Molar weight | 142,04 g/mol |
| Transparency | transparent to translucent |
| Cleavage | perfect |
| Crystal habit | |
| Twinning | |
| Phase transition | |
| Chemical behavior | |
| Comments | soluble in water and glycerin, not soluble in pure alcohol |
| Crystal Optics | |
| Refractive Indices | nx = 1,468 ny = 1,473 nz = 1,483 |
| Birefringence | Δ = 0,015 |
| Optical Orientation | positive |
| Pleochroism | |
| Dispersion | |
| Used Literature | |
| {{{Literature}}} | |
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Weblinks[edit]
- ↑ http://webmineral.com/data/Thenardite.shtml viewed on 29/07/2010
- ↑ http://www.mindat.org/min-3935.html viewed on 29/07/2010