Starkeyite
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| Starkeyite[1][2] | |
| Mineralogical name | Starkeyite, Leonhardtite |
| Chemical name | Magnesiumsulfate Tetrahydrate |
| Trivial name | |
| Chemical formula | MgSO4•4H2O |
| Other forms | Kieserite (MgSO4•H2O) Sanderite (MgSO4•2H2O) Pentahydrite (MgSO4•5H2O) Hexahydrite (MgSO4•6H2O) Epsomite (MgSO4•7H2O) Meridianite (MgSO4•11H2O) Magnesium 12-Hydrate |
| Crystal system | monoclinic |
| Crystal structure | |
| Deliquescence humidity 20°C | |
| Solubility (g/l) at 20°C | |
| Density (g/cm³) | |
| Molar volume | 95.87 cm3/mol |
| Molar weight | 192.3 g/mol |
| Transparency | translucent to opaque |
| Cleavage | |
| Crystal habit | |
| Twinning | |
| Phase transition | |
| Chemical behavior | |
| Comments | not stable in air |
| Crystal Optics | |
| Refractive Indices | nx = 1.49 ny = 1.491 nz = 1.497 |
| Birefringence | Δ = 0.007 |
| Optical Orientation | positive |
| Pleochroism | |
| Dispersion | |
| Used Literature | |
| {{{Literature}}} | |
back to Sulfate
Weblinks[edit]
- ↑ http://webmineral.com/data/Starkeyite.shtml viewed on 29/07/2010
- ↑ http://www.mindat.org/min-3752.html viewed on 29/07/2010